Holosun DRS-TH Thermal Red Dot Sight
Red dot speed by day. Thermal fusion by night.
A 1× LED red dot with a built-in 256×192 thermal sensor that overlays live heat signatures inside the sight picture on a 1024×768 OLED at 50 FPS — so you see what darkness, fog or brush is hiding, without changing optics.
- 256×192Thermal sensor
- <50 mKSensitivity
- 1·3·5×Digital zoom
- 10 hThermal runtime
- Authorized dealerUPC 810047072942 · MPN DRS-TH
- Free shippingCode SWATOPTICS at checkout
- WarrantyHolosun manufacturer warranty
- ReturnsResold brands are final sale — Refund Policy
SWAT Optics reviews the DRS-TH
SWAT Optics · Hands-onHolosun DRS-TH: Discussion & Quick Overview – The Optic You NEED to See! · SWAT Optics · June 8, 2025
See it work
One scene, five ways to see it. Tap a mode, then zoom.
How the DRS-TH works
-
Thermal fusion overlay
The 256×192 sensor (25 mm F1.1 lens, 7.2° × 5.3° field of view) places heat signatures directly in the viewing window, with 1×, 3× and 5× digital zoom and a Cross or T-style thermal reticle.
-
Holosun red dot underneath
A 1× enclosed reflex sight with the Multi-Reticle System — 2 MOA dot, 65 MOA circle, or both — unlimited eye relief, 8 daylight and 4 night-vision brightness settings, and Shake Awake.
-
Records what you see
Built-in video recording with on-board storage. Two removable 18350 batteries charge through a magnetic USB port without pulling the optic off the rifle.
- White HotHeat shown white — high contrast
- Black HotHeat shown black — bright or busy scenes
- OutlineHeat sources drawn as outlines
- HighlightHottest areas pop in color
Every angle of the DRS-TH
Runtime on two 18350s
Up to 10 hours of thermal in observation mode, about 8 with every function running. Magnetic USB charging, no tools.
DRS-TH vs DRS-NV
Same housing, window, mount and red dot. Thermal detects heat with no light at all; digital night vision shows more detail and sees through glass, but needs some light.
| DRS-TH · Thermal | DRS-NV · Night vision | |
|---|---|---|
| Imaging | Thermal · 256×192 sensor | Digital night vision · 1920×1080 sensor |
| Sees | Heat (8–14 µm) — no light needed | Light (400–950 nm) — down to 0.01 lux, IR illuminator for full darkness |
| Through glass | No | Yes |
| Display | 1024×768 OLED · 50 FPS | 1024×768 OLED · 30/60 FPS |
| Digital zoom | 1× · 3× · 5× | 1× · 2× · 4× · 8× |
| Lens · field of view | 25 mm F1.1 · 7.2° × 5.3° | 25 mm F1.2 · 7.2° × 5.3° |
| Runtime | 10 h observation · 8 h full | 8 h observation · 6 h full |
| Body weight | 18 oz | 18.5 oz |
| Shared | Red dot MRS · Shake Awake · recording · IP67 · 7075-T6 · Picatinny mount | Same |
Holosun DRS-TH spec sheet
Reflex sight
- Reticle
- 2 MOA dot & 65 MOA circle (Multi-Reticle System)
- Light source
- LED · 650 nm
- Magnification
- 1×
- Brightness
- 8 daylight & 4 night vision
- Shake Awake · memory mode
- Yes · Yes
- Eye relief
- Unlimited
Thermal
- Sensor
- 256×192
- Sensitivity (MRTD)
- <50 mK
- Display
- 1024×768 OLED · 50 FPS
- Lens
- 25 mm · F1.1
- Field of view
- 7.2° × 5.3°
- Spectral range
- 8–14 µm
- Focus range
- 5 m – infinity
- Digital zoom
- 1× · 3× · 5×
- Image modes
- White Hot · Black Hot · Outline · Highlight
- Thermal reticle
- Cross & T style
- Recording
- Video, on-board storage
Power
- Batteries
- 2× 18350 rechargeable, removable
- Runtime
- Observation 10 h · full function 8 h
- Charging
- 5V/1A magnetic USB
Build & mount
- Housing
- 7075-T6 aluminum, anodized black
- Adjustment
- 0.5 MOA per click · ±50 MOA travel
- Window
- 1.25″ × 0.98″
- Body
- 3.7″ × 2.2″ × 3.5″ · 18 oz
- Mount
- Picatinny · 1.72″ center height · 2.3 oz
- Protection
- IP67 · 1000G vibration
- Temperature
- Working −20 to 50 °C · storage −40 to 70 °C
What’s in the box
- DRS-TH optic
- 2× 18350 rechargeable batteries
- Magnetic USB charging & data cable
- Lens cloth
- Multi-tool
- Wrench
- Manual
- Warranty card
Specifications from Holosun Technologies (holosun.com), September 2026. Holosun may update specifications without notice. Thermal performance varies with distance, temperature contrast and weather.
Holosun DRS-TH questions, answered
What is the Holosun DRS-TH?
The DRS-TH (Digital Reflex Sight – Thermal) is a Holosun red dot sight with a built-in 256×192 thermal sensor. It overlays real-time thermal imaging inside the red dot sight picture on a 1024×768 OLED display at 50 frames per second.
What is the thermal resolution of the Holosun DRS-TH?
The DRS-TH uses a 256×192 thermal sensor with under 50 mK sensitivity (MRTD), a 25 mm F1.1 lens and a 7.2° × 5.3° field of view, displayed on a 1024×768 OLED screen at 50 FPS.
How long does the DRS-TH battery last?
Two removable 18350 rechargeable batteries give up to 10 hours in thermal observation mode, or about 8 hours with all functions running. They charge through a magnetic USB port without removing the optic.
Can I use the DRS-TH as a regular red dot?
Yes. It is a 1× red dot with Holosun’s Multi-Reticle System (2 MOA dot, 65 MOA circle, or both), unlimited eye relief and Shake Awake, with the thermal overlay available when you need it.
What thermal modes does the DRS-TH have?
White Hot, Black Hot, Outline and Highlight, with selectable 1×, 3× and 5× digital zoom and Cross or T-style thermal reticles.
Holosun DRS-TH vs DRS-NV: which should I buy?
Choose the DRS-TH if you need to detect heat in total darkness, smoke or brush — its 256×192 thermal sensor needs no light at all. Choose the DRS-NV if you want more image detail and the ability to see through glass — its 1920×1080 digital night vision sensor works down to 0.01 lux and may need an infrared illuminator in full darkness.
Can the DRS-TH see through glass?
No. Like all thermal imagers working in the 8–14 µm band, the DRS-TH cannot see heat through ordinary glass such as windows or windshields. Digital night vision like the DRS-NV can see through glass.
Is the Holosun DRS-TH waterproof?
Yes. The DRS-TH is IP67 rated and built from 7075-T6 aluminum with 1000G vibration resistance.
How much does the DRS-TH weigh?
The body weighs 18 oz and measures 3.7 × 2.2 × 3.5 inches. The included Picatinny mount adds 2.3 oz and gives a 1.72-inch center height.
Does the DRS-TH record video?
Yes. The DRS-TH has built-in recording with on-board storage, so you can capture and review footage directly from the optic.