BTH V3

Burris BTH v3 — Thermal Handheld

Models: BTH19 v3  |  BTH35 v3 | #Item 300636

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Tech Note — “Clicking” sound: At times you may hear a faint click from the thermal. This is the internal shutter performing a refresh (NUC) to maintain image quality. This is normal operation and has been field-tested while hunting — animals do not hear it.

1) Item Numbers & Physical Components

Item #	Component	What it does
1	Power Button & Indicator	On/Off, Stand-by; LED shows working/charging status (adjustable in settings).
2	USB-C Charging/IO Port	Charge/power, file transfer, analog video via USB-C→RCA, BurrisConnect app.
3	Tripod Mount (1/4-20)	Standard threaded insert for mounting.
4	Focusing Ring (Objective)	Manual focus; min focus: BTH35 v3 ≈ 3 ft, BTH19 v3 ≈ 18 in.
5	Diopter Adjustment (Eyepiece)	Focuses the display to your eye for a crisp menu/image.
6	Photo/Video Button	Short press (Photo); long press (Start/Stop Video). Saves to internal memory.
7	Up Arrow	Zoom up / menu navigate up.
8	Down Arrow	Zoom down / menu navigate down.
9	Left Arrow / Back	Cycle palettes (shortcut) / back in menus.
10	Right Arrow / Expand	Cycle scene modes (shortcut) / expand in menus.
11	Menu Button (M) / Select	Open settings; confirm selections.
12	Objective Lens	Thermal objective (Germanium) — keep covered when not in use.
13	Accessory Rail Mount Holes	For included Picatinny rails.

2) Core Specifications

Category	Detail
Detector	VOx 400×300, 12 µm, 50 Hz; NETD ≤50 mK @ F1 (25 °C); 8–14 µm spectral
Display	0.4″ LCOS, 1280×960; eye relief ≥17 mm; exit pupil ≥5.3 mm; eyepiece mag 13.8×
Power	Internal 2×18650; ≥5 hours @ 25 °C; Auto Stand-by OFF/5/10/15 min; Auto Power-Off OFF/5/30/60 min
Interfaces	USB-C (charge/power, file transfer, analog video); BurrisConnect live streaming
Mounting	UNC 1/4-20 tripod insert; accessory Picatinny rails (included)
Environment	Waterproof; operating temp 14 °F to 122 °F (-10 °C to 50 °C)
Size/Weight	9.8″ × 2.4″ × 2.8″; ≤22 oz (≤630 g)

Model Differences

Model	Focal Length	FOV (deg)	Optical Zoom	Digital Zoom	Detection (Deer)
BTH19 v3	19 mm F1.0	14.4 × 10.8	1.8×	1×–4×	~500 m / 550 yd
BTH35 v3	35 mm F1.0	7.8 × 5.9	3.3×	1×–4×	~1000 m / 1100 yd

3) Included Accessories

• Neck strap, wrist strap, carrying case
• M1913 accessory rails (mounting holes on unit)
• USB-C→USB-A cable (charge/data) & USB-C→RCA (analog video)

4) Power & Charging

• Charge fully before first use (5 V/2 A). Avoid charging above 104 °F / 40 °C.
• Working Indicator (power-button LED) doubles as Charging Indicator; both can be disabled/brightness-adjusted in General Settings.
• Auto Stand-by and Auto Power-Off timers available in Power Settings.
• Built-in 16 GB storage for photos/video; transfer via app or USB; “Reformat Storage” clears memory.

5) Operation

• Stand-by: Hold Power and release before the shutdown bar completes (stays connected via Wi-Fi).
• Focus: Adjust eyepiece diopter until menu text is crisp; then use objective focusing ring for distance (min focus: 3 ft on BTH35 v3; 18 in on BTH19 v3).
• Zoom: Up/Down for 1×/2×/4× steps; hold Up/Down for Smooth Zoom.
• Shortcuts: Left = cycle palettes; Right = cycle scene modes; M opens menu.

6) Menus

• Color Palettes: White Hot, Black Hot, Red Hot, Green Hot, Blue Hot, Amber, Sepia, Iron, Inferno.
• Thermal Settings: Image Enhancement (on/off), Contrast slider, Scene Modes (Nature / Enhanced / Highlight), Thermal Intensity, Calibration (Auto / Manual), Hot Track.
• General Settings: Screen Brightness; Picture-in-Picture (2× window: UL/UM/UR); Time/Date & Watermark; Units (yd/m); Languages (EN, ES, IT, FR, DE, RU, FI, SV, DA, PL); Working/Charging Indicators on/off & brightness.

7) Stadiametric Rangefinder

• Animal stadia: Rabbit (20 cm), Coyote (52 cm), Hog (80 cm), Deer (100 cm).
• Align lower line to the target’s base; adjust spacing to the top; distance displays automatically.

8) Wi-Fi & BurrisConnect

• SSID: BTH-XXXX (default), password: 12345678 — enable Wi-Fi in menu, connect phone, open BurrisConnect.
• App provides live view, remote control, photos/video, and remote palette/scene/brightness controls.

9) Care

• Protect the Germanium objective with the lens cover when not in use; clean only when needed with blower/brush/lens tools.
• Do not point at high-intensity sources (sun/lasers) to avoid sensor damage.
• Store in a dry, ventilated space; if storing long-term, top-up charge for 4 hours every two months to prolong battery life.

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User Guide (PDF): BTH v3 User Manual