Holosun DRS-TH (Digital Reflex Sight - Thermal) Multi Reticle Red Dot Sight

Holosun DRS-TH — Reflex Sight with Integrated Thermal Channel

The Holosun DRS-TH is a hybrid optoelectronic sight that combines a classic closed reflex sight (LED red dot) with an integrated thermal imaging module in a single housing. The device is designed for hunting, tactical disciplines, and airsoft, where speed of aiming and the ability to detect targets regardless of lighting conditions are essential.

The core of the device is an uncooled thermal sensor with a resolution of 256×192 pixels, operating at a 50 frames-per-second refresh rate. The image is displayed on a built-in OLED screen with a resolution of 1024×768 pixels, providing a clear picture in any lighting. The thermal channel has a spectral range of 8–14 µm, a lens focal length of 25 mm, an aperture of F1.1, and a focus range from 5 m to infinity, with a field of view of 7.2°×5.3°.

Technical Specifications 

How It Performs in the Field

The key feature of the DRS-TH is its Thermal + Red Dot Fusion mode: the thermal sensor overlays the target's heat outline directly onto the reflex sight's picture, allowing the user to keep the aiming point visible in darkness, fog, or smoke. When the thermal channel isn't needed, the front lens cap can simply be flipped down, and the sight functions as a standard closed reflex sight with a battery life of over 50,000 hours — making the device a versatile solution on a single platform without the need to swap optics.

For hunters, this means reliable detection of game by its thermal outline in brush and tall grass at dawn and dusk. For tactical and airsoft scenarios, the sight offers an advantage in smoke-filled environments and in darkness, where standard optics are useless. The built-in video recording function allows users to capture footage at the push of a button — useful for reviewing training sessions or documenting a hunt.

Durability and Build Quality

The housing is made of aviation-grade 7075-T6 aluminum alloy with an anodized finish and meets the IP67 protection standard, ensuring reliable operation in rain, dust, and dirt. Shock resistance of 1000 G ensures reliable electronics performance when firing weapons with strong recoil. The Shake Awake technology activates the red dot illumination at the slightest movement of the weapon, ensuring instant readiness to fire without excessive battery drain.

Installation, Zeroing, and Maintenance

The sight mounts onto a standard Picatinny rail and is secured with a Torx screw, included along with a hex wrench — installation requires no special tools. Zeroing is done using the included tool, with a click value of 0.5 MOA and a horizontal/vertical adjustment range of up to ±40–50 MOA depending on the regional version, which is sufficient for precise zeroing at most practical distances. Maintenance is limited to charging via the magnetic USB cable and, if needed, replacing the 18350 or CR123A batteries — when using standard (non-rechargeable) batteries, the charging cable must not be connected, to avoid damaging the device.

Why Choose The Holosun DRS-TH

The Holosun DRS-TH addresses two needs in one device: fast daytime aiming and thermal observation in darkness, rain, or fog, without the need for additional optics. Compatibility with the HM3X/HM3XT/HM6X magnifier lineup extends its usability at medium and extended distances. The sight is compatible with the Picatinny rail found on most modern platforms.

You can purchase the original Holosun DRS-TH at a competitive price from Professional Optics in Split, Croatia — with delivery across Europe and expert guidance on selecting and setting up thermal optics.