It features a second-generation 640 × 512 detector with 15 mK NETD and a 20% responsivity gain, producing a cleaner, more detailed thermal image than the RH25 V2’s 640 × 480 sensor. Its in-house FastEngine architecture cuts latency by 21%, reducing lag and fatigue during long nights of movement. In clip-on mode, it now supports day scopes from 1 to 10× (up from 6×), thanks to a 2560 × 2560, 1.03-inch display. The body is also shorter and narrower, freeing up rail space and improving binocular alignment. Runtime extends to up to 9 hours on a single 18650 battery when using Auto Power Save, and three independent zero profiles let you swap rifles or day optics without re-zeroing. Standalone use adds Picture-in-Picture for a magnified aiming window without losing situational awareness. Across all modes, you get an overhauled UI, -40°F cold-weather batteries, and IP67 water and dust resistance.

• Helmet FOV: The 17.5° × 13.1° field of view is unchanged from the RH25, giving a familiar sight picture for scanning and hunting.
• Width: The unit is trimmed from 65.8 mm to 63.4 mm, leaving more room for interpupillary adjustment in dual-unit binocular setups.
• Clip-on length: Length is down 12% to 101 mm, freeing rail space for a laser, illuminator, or weapon light.
• Enhanced clip-on support: Clip-on mode now supports day optics from 1 to 10× (up from 6×), thanks to the 1.03-inch AMOLED display.
• Clip-on zeroing: Three independent zeroing profiles with numerical zero values let you save distinct zeros across rifles or day-optic setups without re-zeroing.
• Clip-on UI: Zero, battery status, and mode indicators are positioned to stay visible without occluding the sight picture or crowding the target area.
• Dual-Link: Two H25s pair into one thermal binocular system with menu, palette, image settings, and zoom controlled from a single master unit.
• Optimized for dual-band: Dedicated NV modes strip out low-temperature ambient clutter so thermal and night vision fuse more easily, and outline mode reduces heat sources to clean outlines that give location and shape while night vision carries the environmental picture.
• Magnification: 1× base magnification with up to 4× digital zoom gives a wide native picture for search, then lets you close in on a heat signature, with smoothed zoom transitions for a more natural feel.
• Wireless remote: The included remote controls recording, brightness, and menus, with a scroll wheel for digital magnification and menu navigation without taking your hands off the gun or tripod.
• Power management: True Sleep drops the unit into an ultra-low-power state during downtime, flip-to-standby powers it down the moment it’s flipped out of position, and Power-Saving Mode stretches runtime to 9 hours on a single 18650 battery.
• Handheld scanning: Covers ground quickly while retaining the detail to confirm what you’ve found, suiting hunting, predator control, property scanning, and wildlife observation.
• Weapon sight controls: Customizable reticles, app-based zeroing, and adjustable reticle brightness provide the controls expected from a modern thermal riflescope.
• Recording output: Recorded video resolution increases from 768×576 on the RH25 V2 to 1280×960 on the H25, roughly 2.8× the pixels, for noticeably sharper footage.