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The Armasight Sidekick 640 thermal monocular is a compact, handheld thermal imaging device built for hunters, tactical operators, and outdoor professionals who need reliable heat detection in low-light or no-light conditions. At under 250 grams, this 640-resolution thermal monocular delivers genuine thermal imaging capability in a form factor small enough to stow in a pack or mount to your helmet—making it one of the lightest fully functional 12-micron thermal cores on the market. The 60Hz refresh rate keeps motion smooth and natural, while the 19mm lens and digital 1x-4x zoom give you flexibility to scan terrain or focus on distant targets. Whether you're conducting night operations, searching for game after dark, or surveying property from a distance, the Sidekick 640 works as a standalone optic or pairs with existing night vision gear via the included dovetail mini-rail.
Image quality comes from Armasight's Iron Wolf thermal technology platform, which prioritizes crisp detail in the field. The XGA OLED display (1024×768 resolution) renders thermal signatures with sharp contrast and active on-screen graphics that show compass bearing, battery status, and zoom level—all readable without fumbling. Field controls are stripped down to three buttons for intuitive operation, even with gloved hands. One-touch recording lets you capture video or stills directly to internal memory, and USB-C connectivity supports video streaming to an external device or future accessory integration.
Runtime balances portability and endurance: a single CR123A battery powers roughly 1.5 hours of operation; swap in two CR123A cells (or use the included battery extender with a 16650) and you'll stretch that to 5.5 hours. The rugged ULTEM composite body is sealed to IP67 standards and rated for extreme temperatures from −40°F to +122°F. This unit is designed and assembled in the USA from a blend of U.S. and global components. A 3-year warranty (with registration) backs your investment, and the package includes two batteries, USB-C cable, lens cloth, soft case, and manual—everything you need to get thermal imaging up and running today.
| Thermal Detector | ArmaCORE 640×480, 12-micron |
| Thermal Sensitivity | NETD < 40mK |
| Detection Range (Human Target) | 709 meters |
| Recognition Range (Human Target) | 177 meters |
| Identification Range (Human Target) | 111 meters |
| Refresh Rate | 60 Hz |
| Optical Magnification | 1× |
| Digital Zoom | 1×–4× |
| Lens System | F/1.00, 19mm manual focus |
| Eye Relief | 15mm |
| Field of View | 24.16° × 17.37° |
| Diopter Adjustment Range | −5 to +5 diopters |
| Display | XGA OLED, 1024 × 768 pixels |
| Power Supply | 1× CR123A or 2× CR123A or 1× 16650 (with extender) |
| Battery Life | 1.5 hours (1× CR123A); 5.5 hours (2× CR123A) |
| Video Recording Capacity | 4 hours internal storage |
| Environmental Rating | IP67 |
| Operating Temperature | −40°C to +50°C (−40°F to +122°F) |
| Dimensions | 145 × 50 × 65mm (5.7 × 1.9 × 2.6 inches) |
| Weight | 242 grams (0.53 pounds) |
| Color | Black |
| Warranty | 3 years with registration |
Yes. The unit includes a dovetail mini-rail for helmet mounting. For compatibility with PVS-14 night vision devices or additional Sidekick units in a bridged configuration, you can pair it with an optional Rayvn Group modular bridge mount (sold separately), which allows thermal and night vision image collimation.
A single CR123A battery delivers approximately 1.5 hours of operation at 20°C (68°F). Using two CR123A batteries or the included battery extender with a 16650 battery extends runtime to 5.5 hours. Both CR123A batteries are included with the unit.
The Sidekick 640 comes with the thermal monocular, two CR123A batteries, a USB-C cable, lens cloth, soft carrying case, and the product manual.
Yes. The monocular features one-touch video and image recording with 4 hours of total internal storage capacity. You can also stream video via the USB-C interface to an external device.
SKU: 114461731 • Weight: 1oz