Introduction: Protecting Your Investment

You've invested $1,500-$3,500 in a professional thermal scope like the GTGUARD X350L or X650L. With proper care, this investment will deliver 10-15 years of reliable performance. Without it, you risk degraded image quality, sensor damage, electronic failures, and premature replacement.

Thermal scopes contain sophisticated technology: uncooled microbolometer sensors measuring temperature differences to 0.045°C, precision optical systems, advanced electronics, and sealed housings protecting against environmental intrusion. This complexity demands specific maintenance protocols that differ from traditional rifle scopes.

This comprehensive guide provides everything you need to maintain your thermal scope for maximum lifespan and optimal performance. Based on manufacturer specifications for the X350L and X650L, field experience from professional users, and thermal imaging best practices, you'll learn exactly how to clean, store, troubleshoot, and maintain your thermal optic through years of demanding use.

Understanding Thermal Scope Components

The Microbolometer Sensor: Your Scope's Heart

The microbolometer detector (384×288 in X350L, 640×512 in X650L) is the most critical and delicate component:

What It Does:

• Measures infrared radiation from all objects
• Converts heat signatures into electrical signals
• Refreshes 50 times per second for smooth imaging
• Operates uncooled at ambient temperature

Why It's Delicate:

• Pixel pitch of 12μm = incredibly small elements
• Susceptible to shock and vibration damage
• Sensitive to moisture and contamination
• Cannot be field-replaced (factory service only)

Protection Priority: The microbolometer sensor typically lasts 10,000-20,000 operational hours (decades of hunting use), but physical damage, moisture intrusion, or severe shock can instantly destroy functionality.

Optical Components

Objective Lens (Front):

• X350L: 35mm F1.0
• X650L: 50mm F1.0
• Germanium lens material (specific to thermal)
• Anti-reflective coating for maximum transmission
• Primary protection: Front lens cap

Eyepiece Lens (Rear):

• 28mm diameter on both models
• Diopter adjustment: -5 to +3
• Rubber eyecup for comfortable viewing
• Less exposed than objective but still vulnerable

Lens Coatings: Modern thermal lens coatings are sophisticated multi-layer systems optimized for infrared transmission. These coatings are THIN (measured in nanometers) and can be damaged by:

• Abrasive cleaning materials
• Harsh chemical cleaners
• Excessive cleaning pressure
• Dirty cloths transferring particles

Electronic Systems

Display:

• 0.39" Micro-OLED, 1024×768 resolution
• Thousands of operational hours lifespan
• Sealed within housing (no user maintenance)
• Can degrade if exposed to extreme moisture/heat

Battery System:

• Four 16340 rechargeable lithium-ion batteries
• 3.7V 900mAh each
• Hundreds of charge cycles lifespan
• Degradation accelerated by improper charging/storage

Integrated Rangefinder:

• 905nm laser (Class 1, eye-safe)
• Precision optics aligned during manufacture
• Cannot be field-serviced
• Shares objective lens optical path

Internal Electronics:

• Image processing circuits
• Sensor control systems
• Wi-Fi module (if equipped)
• All sealed within IP67 housing

Daily Care and Handling

Pre-Hunt Inspection

Develop a routine 5-minute pre-hunt check:

1. Optical Inspection:

• Remove lens caps
• Examine objective lens for dirt, moisture, smudges
• Check eyepiece for cleanliness
• Look for any cracks, chips, or coating damage
• Verify lens caps seal properly

2. Battery Check:

• Power on scope
• Check battery indicator
• Verify >50% charge for hunt duration
• Inspect battery contacts for corrosion
• Confirm batteries seat properly

3. Functional Test:

• Power on, verify normal boot sequence
• Test thermal image clarity
• Activate laser rangefinder (range known object)
• Cycle through color palettes
• Test digital zoom function
• Verify PiP mode operates
• Check hotspot tracking

4. Mounting Verification:

• Inspect mount screws (proper torque, no looseness)
• Check rail interface for wear
• Verify scope sits level on rifle
• Ensure no movement in mount

5. Protective Check:

• Verify lens caps present and functional
• Check rubber eyecup condition
• Inspect housing for new damage
• Confirm USB-C port cover sealed

This 5-minute inspection prevents field failures and identifies issues before they become critical.

Field Handling Best Practices

Lens Cap Discipline:

The #1 cause of lens damage is forgetting lens caps. Develop muscle memory:

Approaching Hunting Position:

• Lens caps ON until settled and ready
• Remove caps only when beginning to scan
• Never walk through brush/vegetation with open lenses

During Hunt:

• Caps OFF for active hunting
• If moving positions, caps back ON
• Rain/snow? Caps ON or wipe frequently

Leaving Field:

• Caps ON before packing
• Double-check both front and rear
• Secure caps with retainer cord if available

Temperature Management:

Thermal scopes handle extreme temperatures (-40°F to 131°F operational for X350L/X650L), but rapid changes cause problems:

Coming from Cold to Warm:

1. Seal scope in plastic bag while still cold
2. Move to warmer environment
3. Wait 30-60 minutes for gradual warming
4. Check for condensation before removing from bag
5. If dry, remove and store normally

Why This Matters: Bringing a -20°F scope directly into a 70°F room causes instant condensation INSIDE the sealed housing. While IP67 rated against external moisture, internal condensation from rapid temperature change can fog display and corrode electronics.

Coming from Warm to Cold:

• Less problematic than warm-to-cold
• Simply allow gradual cooling
• Verify battery performance in cold
• Keep spare batteries body-warm

Shock and Vibration Protection:

The microbolometer sensor survives rifle recoil but hates other impacts:

In Vehicle:

• Secure scope in padded case
• Prevent sliding/rolling during transport
• Don't leave loose on seat (sudden stops!)
• Trunk storage: secure to prevent shifting

On Foot:

• Quality padded case or protective wrap
• If mounted on rifle, use padded rifle case
• Avoid bumping against trees, rocks, fences
• Set down gently, don't drop on ground

Climbing/Difficult Terrain:

• Extra care when climbing stands or rocks
• Hand rifle to partner rather than risk fall
• Consider removing scope for difficult climbs

Recoil Considerations:

• X350L/X650L rated for most hunting calibers
• Use appropriate recoil-rated mount
• Verify proper torque on mounting screws
• Magnum calibers: check zero after 50 rounds

Cleaning Procedures

When to Clean (and When NOT to)

Clean Immediately If:

• Visible fingerprints on lenses
• Water spots/dried rain drops
• Obvious dirt/mud on optics
• Condensation dried on lens
• Performance degradation noticed

Don't Clean If:

• Minor dust only (blow off, don't wipe)
• Lens appears clean
• "Preventive" cleaning urge (unnecessary)

Cleaning Frequency:

• After wet weather hunts
• Every 5-10 uses minimum
• When image quality degrades
• Before extended storage

Over-Cleaning Danger: Each cleaning contact risks microscopic abrasion to coatings. Clean when necessary, not excessively.

Proper Lens Cleaning: Step-by-Step

Tools Required:

• Microfiber lens cloth (clean, dedicated to optics)
• Lens cleaning solution (96% isopropyl alcohol or optical-grade cleaner)
• Compressed air or rocket blower
• Cotton swabs (for housing, NOT lenses)
• Lens tissue (optional, for heavy contamination)

Step 1: Remove Loose Particles

1. Remove lens caps
2. Hold scope with lens pointing DOWN
3. Use compressed air or rocket blower
4. Blow from center to edge in short bursts
5. Never use your mouth (moisture!)
6. Continue until no visible dust falls

Why Down: Gravity helps particles fall away instead of settling back.

Step 2: Dry Wipe (if Still Contaminated)

1. Use CLEAN microfiber cloth
2. Start at lens center
3. Wipe in circular motion moving outward
4. Use gentle pressure only
5. Flip cloth to clean section frequently
6. Never reuse dirty section

If Clean After Dry Wipe: STOP. Done.

Step 3: Wet Cleaning (if Necessary)

1. Inspect microfiber cloth: absolutely clean?
2. Dampen (not soak) cloth with optical cleaner
3. Wring excess moisture out
4. Starting center, wipe in circular motion to edge
5. Immediately follow with DRY section of cloth
6. Buff gently until no streaks remain

For Stubborn Contamination (fingerprints, dried water):

1. Use lens tissue folded into pad
2. Dampen with 96% isopropyl alcohol
3. Single wipe across contaminated area
4. Discard tissue immediately
5. Follow with dry microfiber cloth buff

What to NEVER Use:

• Shirt sleeve, jacket, or clothing
• Paper towels (too abrasive)
• Household cleaners (damage coatings)
• Saliva (seriously, don't)
• Dirty or previously used cloths
• Excessive pressure

Eyepiece Cleaning: Same procedure as objective lens, though typically less contaminated due to rubber eyecup protection.

Housing and Body Maintenance

Monthly Cleaning:

1. Remove all batteries
2. Damp (not wet) cloth wipe exterior
3. Cotton swab for crevices around buttons
4. Clean turret adjustments
5. Wipe Picatinny rail mounting surface
6. Dry thoroughly with clean cloth
7. Check USB-C port cover (sealed?)
8. Inspect rubber eyecup for cracks
9. Verify lens caps functional

Battery Compartment:

1. Remove batteries
2. Inspect contacts for corrosion (white/green buildup)
3. If corroded: cotton swab with isopropyl alcohol
4. Wipe contacts clean and dry
5. Allow to air dry 15 minutes
6. Reinstall batteries

Avoid:

• Harsh chemical cleaners on housing
• Water submersion for "cleaning"
• Abrasive scrubbing
• Pressurized water spray

Display and Internal Maintenance

User Maintenance: NONE

The display, sensor, and internal electronics are SEALED. Attempting to open housing voids warranty and risks moisture/dust intrusion.

If Display Appears Dirty (spots, lines):

• This is sensor dust/artifacts, not screen dirt
• Perform NUC (Non-Uniformity Correction) calibration
• If persists, contact manufacturer support
• Do NOT attempt to access internal display

Battery Care and Management

Lithium-Ion Battery Best Practices

The X350L and X650L use four 16340 (RCR123A) 3.7V 900mAh rechargeable batteries. Proper battery care dramatically affects field reliability.

Charging Protocol:

First Use:

• Charge all batteries to 100% before first hunt
• Use only provided charger (or manufacturer-approved)
• Charging time: 2-3 hours per set
• Verify charger indicator shows complete

Regular Use:

• Recharge when capacity drops to 20-30%
• Avoid complete discharge (degrades capacity)
• Don't leave on charger after 100% (overcharging)
• Charge at room temperature (not hot or freezing)

Storage Charging:

• For storage >2 weeks: charge to 50-60%
• Check every 2-3 months, recharge to 50-60% if dropped
• Never store fully depleted
• Never store at 100% for extended periods

Temperature Effects:

Cold Weather Impact:

• 70°F: 100% capacity
• 32°F: ~85% capacity
• 0°F: ~65% capacity
• -20°F: ~50% capacity

Solutions:

• Keep spare batteries in inside coat pocket
• Rotate warm spares into scope when performance drops
• Batteries regain capacity when warmed

Hot Weather:

• Avoid leaving in direct sunlight
• Don't charge batteries immediately after hot vehicle transport
• Allow cooling to room temperature first

Battery Lifespan:

Expected Cycle Life:

• 300-500 full charge cycles
• ~2-3 years of typical hunting use
• Signs of degradation:
  • Capacity drops below 70% of original
  • Charging takes abnormally long/short
  • Batteries get excessively hot during use/charging
  • Runtime significantly reduced

When to Replace:

• All four batteries simultaneously (matched set)
• Use manufacturer-specified batteries only
• Don't mix old and new batteries
• Don't mix different brands/capacities

Safety Warning:

Lithium-ion batteries can fail catastrophically if:

• Physically damaged (dented, punctured)
• Exposed to extreme heat (>140°F)
• Charged with wrong charger
• Shorted (damaged wrapping)

If Battery Damaged:

• Remove from service immediately
• Dispose properly (battery recycling center)
• Never attempt to use damaged battery

Storage: Short-Term and Long-Term

Between-Hunt Storage (Days to Weeks)

Immediate Post-Hunt:

1. Remove scope from rifle
2. Wipe down exterior (remove dirt/moisture)
3. Clean lenses if necessary
4. Replace lens caps
5. Store in protective case
6. Batteries: leave installed if hunting again within week

Storage Location:

• Room temperature (65-75°F ideal)
• Low humidity area
• Away from direct sunlight
• Secure location (prevent theft)
• Not in unheated garage (temperature extremes)

Case Storage:

• Hard or padded soft case
• Add desiccant pack (silica gel) if humid climate
• Don't over-pack (pressure on scope)
• Store upright or flat, not on side

Long-Term Storage (Off-Season)

Pre-Storage Preparation:

1. Full cleaning (lenses, housing, battery compartment)
2. Remove all four batteries
3. Store batteries separately at 50-60% charge
4. Perform firmware update if available
5. Replace lens caps
6. Document serial number and condition

Storage Best Practices:

• Climate-controlled environment
• Temperature: 50-80°F
• Humidity: 30-60% relative humidity
• Original box with foam inserts (ideal)
• Protective case minimum
• Desiccant packs included
• Store separate from rifle (different cases)

Monthly Checks During Storage:

• Visual inspection for moisture/condensation
• Check battery charge level (recharge if <40%)
• Verify lens caps in place
• Look for rodent/insect damage (rare but possible)
• Brief power-on test (optional, every 2-3 months)

Pre-Season Activation:

1. Remove from storage
2. Visual inspection
3. Clean lenses if necessary
4. Install fully-charged batteries
5. Power on, full function test
6. Verify zero (test fire if possible)
7. Update firmware if new version available

Firmware Updates and Software Maintenance

Why Firmware Updates Matter

Manufacturers release firmware updates to:

• Fix bugs and glitches
• Improve image processing
• Add new features
• Enhance rangefinder accuracy
• Optimize battery performance
• Correct compatibility issues

GTGUARD Update History: Check gtguardhunt.com/support for latest X350L/X650L firmware.

How to Update Firmware

Required:

• Computer (Windows or Mac)
• USB-C cable (provided with scope)
• Firmware file from manufacturer
• Fully charged batteries in scope

Step-by-Step:

1. Download firmware from manufacturer website
2. Extract files to computer desktop
3. Read update instructions completely
4. Install fresh batteries (100% charge)
5. Connect scope to computer via USB-C
6. Power on scope
7. Run firmware update software
8. Follow on-screen prompts
9. Wait for completion (DON'T disconnect!)
10. Scope will reboot automatically
11. Verify new firmware version in menu

Update Frequency:

• Check for updates before each season
• Critical updates: install immediately
• Minor updates: install during off-season
• If scope functions perfectly: updates optional

Update Precautions:

• Never disconnect during update
• Use fresh batteries (don't risk power loss)
• Don't attempt if uncertain
• Contact support if update fails

Calibration and Zeroing Maintenance

Non-Uniformity Correction (NUC)

NUC calibration compensates for pixel-to-pixel variations in the microbolometer sensor.

When to Perform NUC:

• Power-on (some scopes auto-calibrate)
• After major temperature changes
• If image appears "noisy" or has artifacts
• Every 30-60 minutes during extended use

Manual NUC Procedure:

1. Point scope at uniform surface (sky, wall)
2. Access menu (button combination per manual)
3. Select "NUC Calibration" or "Flat Field Correction"
4. Confirm calibration
5. Scope may close shutter briefly (clicking sound)
6. Image should improve immediately

External OOC (Optics Off Calibration): Some models support external calibration:

1. Point scope at uniform, room-temperature surface
2. Activate external calibration in menu
3. Wait for confirmation
4. Check image quality improvement

Automatic NUC: Many thermal scopes (including GTGUARD models) perform automatic NUC periodically. You'll hear a brief "click" sound—this is normal.

Reticle Zeroing

Zero Check Frequency:

• Every 3-5 hunts minimum
• After traveling with scope
• If scope experiences impact
• When changing ammunition
• Start of each season

Zero Maintenance:

1. Confirm mount torque specifications
2. Test fire at known distance
3. Adjust reticle if necessary using scope buttons
4. Record zero settings
5. Verify at multiple distances if possible

When to Re-Zero:

• POI (Point of Impact) shifts >2 inches at 100 yards
• After mount adjustment
• Switching rifles
• Seasonal temperature changes (extreme)

Troubleshooting Common Issues

Image Quality Problems

Issue: Blurry Image

Possible Causes:

• Lens dirty/smudged
• Eyepiece diopter not adjusted
• Objective focus incorrect
• Condensation inside lens

Solutions:

1. Clean lenses properly
2. Adjust diopter for your eye
3. Focus objective on target
4. If internal condensation: allow gradual warming

Issue: Spotty/Streaky Image

Cause: Sensor artifacts or dust

Solution:

• Perform NUC calibration
• If persists: contact manufacturer

Issue: Reduced Thermal Contrast

Possible Causes:

• Hot ambient temperature (reduces contrast)
• Sensor requires calibration
• Battery voltage low

Solutions:

1. Perform NUC calibration
2. Replace batteries
3. Adjust AGC settings in menu
4. Change color palette

Power and Battery Issues

Issue: Scope Won't Power On

Check:

1. Batteries installed correctly (+/- orientation)
2. Battery charge level
3. Battery contacts clean
4. Scope not in shipping mode

Solutions:

• Try fresh batteries
• Clean battery contacts
• Press/hold power button longer (10 seconds)
• Consult manual for shipping mode reset

Issue: Short Battery Life

Causes:

• Old batteries (degraded capacity)
• Cold weather operation
• Wi-Fi enabled constantly
• Display brightness too high

Solutions:

1. Replace batteries if >2 years old
2. Keep spares warm in cold weather
3. Disable Wi-Fi when not needed
4. Reduce display brightness

Rangefinder Issues

Issue: Rangefinder Won't Read

Possible Causes:

• Target too far or too small
• Environmental conditions (fog, rain)
• Battery low
• Laser module failure

Solutions:

1. Try closer, larger target
2. Wait for clearer conditions
3. Replace batteries
4. If persists: contact support

Issue: Inaccurate Readings

Check:

• Target type (reflective surfaces give errors)
• Atmospheric conditions
• Multiple readings for average

If Consistently Off:

• Document error pattern
• Contact manufacturer support
• May require factory recalibration

Professional Servicing

When to Contact Support

Immediate Contact Required:

• Scope won't power on (after battery troubleshooting)
• Display completely black/white
• Severe image artifacts after NUC
• Obvious damage to housing
• Water intrusion visible
• Rangefinder completely non-functional

Routine Service Recommended:

• Every 2-3 years for professional cleaning
• If dropped from significant height
• After submersion (even if waterproof)
• Persistent image quality issues

Warranty Service (GTGUARD)

X350L and X650L Warranty:

• 2-year manufacturer warranty
• Covers defects in materials/workmanship
• Does NOT cover: abuse, drops, unauthorized repair

Warranty Claim Process:

1. Contact service@gtguardhunt.com
2. Provide order number and serial number
3. Describe issue in detail
4. Follow support instructions
5. If warranty repair: ship scope (insured!)
6. Typical turnaround: 2-4 weeks

Out-of-Warranty Repair:

• Available for reasonable fees
• Get quote before authorizing work
• Consider repair cost vs. replacement

Shipping Thermal Scope for Service

Packing:

1. Remove batteries (ship separately or not at all)
2. Clean exterior
3. Include all accessories if relevant
4. Original box ideal, otherwise:
   • Wrap in bubble wrap (minimum 2 inches all sides)
   • Rigid box with foam inserts
   • Mark "FRAGILE" and "ELECTRONICS"

Shipping:

• Insure for full replacement value
• Use tracking
• Signature confirmation recommended
• Keep tracking number

Include with Shipment:

• Detailed problem description
• Contact information
• Copy of receipt (warranty claims)
• Return shipping address

Extending Lifespan: Advanced Tips

Sensor Longevity

Operational Hours: Microbolometer sensors typically last 40,000-60,000 hours. At 4 hours per hunt and 20 hunts per year = 80 hours annually = 500-750 years of hunting use. You'll upgrade long before sensor fails.

Maximizing Sensor Life:

• Avoid prolonged operation in extreme heat (>130°F)
• Don't leave powered on unnecessarily
• Protect from shock (primary sensor killer)
• Keep firmware updated

Display Care

OLED Display Lifespan: Modern Micro-OLED displays (X350L/X650L) last 10,000+ hours with minimal degradation.

Maximizing Display Life:

• Reduce brightness when sufficient
• Don't leave static image displayed (burn-in risk minimal but possible)
• Power off when not actively hunting

Optical Longevity

Germanium Lenses: Thermal lenses (germanium) are harder than traditional glass, but coatings are delicate.

Lens Care for Decades:

• Clean only when necessary
• Use only appropriate materials
• Lens caps religiously
• Avoid any impact to front lens

Housing and Seals

IP67 Rating Longevity: The waterproof seals degrade over time:

• 3-5 years: excellent sealing
• 5-10 years: good, but monitor for issues
• 10+ years: consider resealing service

Maintaining Seal Integrity:

• Don't force battery cover
• Keep O-rings clean (wipe during battery changes)
• Don't over-tighten covers
• Periodic silicone grease on O-rings (sparingly)

Cost-Benefit Analysis of Proper Maintenance

Maintenance Costs

Annual Maintenance Investment:

• Lens cleaning supplies: $20-30
• Replacement batteries (every 2-3 years): $80-120
• Protective case (if needed): $50-100
• Total: $150-250 over 3 years = $50-85/year

Cost of Poor Maintenance

Potential Repair Costs:

• Lens replacement (damage): $300-600
• Sensor replacement (if possible): $800-1,500
• Display replacement: $200-400
• Full scope replacement: $1,500-3,500

One avoidable repair typically costs more than 5-10 years of proper maintenance.

Real-World Example

Hunter A (Proper Maintenance):

• X350L purchased: $1,800
• Maintenance costs (10 years): $500-850
• Scope condition after 10 years: Excellent, fully functional
• Total cost of ownership: $2,300-2,650 = $230-265/year

Hunter B (Minimal Maintenance):

• X350L purchased: $1,800
• Maintenance costs: ~$100
• Year 4: Lens scratch from improper cleaning = $400 repair
• Year 7: Water damage from improper storage = $1,200 repair
• Year 9: Sensor damage from severe shock = Replace scope $1,800
• Total: $5,300 = $530/year (2× cost of proper maintenance)

Seasonal Maintenance Checklist

Pre-Season (Before Hunting Season)

• [ ] Remove from storage
• [ ] Full cleaning (lenses, housing)
• [ ] Battery charge check/replacement
• [ ] Firmware update check
• [ ] Power-on function test all features
• [ ] Mount on rifle, check torque
• [ ] Range test and zero verification
• [ ] Spare batteries prepared
• [ ] Accessories checked (lens caps, case)

Mid-Season (During Active Use)

• [ ] Weekly lens inspection/cleaning
• [ ] Battery performance monitoring
• [ ] Zero check every 3-5 hunts
• [ ] Housing wipe-down after wet hunts
• [ ] Battery contact cleaning monthly

Post-Season (End of Season)

• [ ] Complete cleaning (lenses, housing, battery compartment)
• [ ] Battery removal and storage prep (50-60% charge)
• [ ] Document any issues or repairs needed
• [ ] Protective storage preparation
• [ ] Firmware update if available
• [ ] Schedule professional service if needed

Conclusion: Maintenance = Performance + Longevity

Proper thermal scope maintenance isn't complicated, expensive, or time-consuming—but it's absolutely essential for protecting your investment and ensuring peak performance when it matters most.

Key Takeaways:

Clean Carefully: Thermal lenses and coatings are delicate. Clean only when necessary, using proper materials and techniques. Over-cleaning causes more damage than under-cleaning.

Protect Aggressively: Lens caps, cases, and careful handling prevent 90% of damage. The scope survives recoil fine—it's the bumps, drops, and careless handling that destroy optics.

Store Properly: Temperature extremes, moisture, and rapid temperature changes are your scope's enemies. Gradual temperature transitions and climate-controlled storage preserve electronics and prevent condensation.

Battery Discipline: Lithium-ion batteries require specific charging and storage protocols. Follow them, and batteries last 300-500 cycles. Ignore them, and batteries fail prematurely.

Regular Inspection: Five minutes of pre-hunt inspection prevents field failures. Catch issues early, address them proactively, and hunt with confidence.

Professional Service: Don't hesitate to contact manufacturer support for persistent issues. GTGUARD's 2-year warranty covers defects—use it when appropriate.

Investment Perspective:

The GTGUARD X350L and X650L represent significant investments that, with proper care, will deliver a decade or more of reliable service. The choice is simple:

• Proper maintenance: $50-85 annually, decades of performance
• Neglect: Premature failure, expensive repairs, replacement costs

Your thermal scope enables ethical, effective hunting in conditions impossible with traditional optics. Protect this capability through consistent, proper maintenance, and your scope will be a trusted hunting partner for years to come.

Ready to maintain your investment? Find complete support resources, firmware updates, and replacement parts at gtguardhunt.com/support.