Armasight Sidekick 640 Thermal Monocular - 19mm Multi-Reticle, 1x-4x Zoom, Black Anodized Hardcoat

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.

Key Features

• Compact 640-resolution 12-micron thermal core under 250 grams—handheld or helmet-mountable
• 60Hz refresh rate for fluid real-time thermal imaging
• 1x optical magnification with 1x-4x digital zoom and 19mm manual-focus lens
• XGA OLED display (1024×768) with active graphics and compass
• Three-button field control designed for gloved operation
• One-touch video and image recording to internal 4-hour capacity
• USB-C interface for video streaming and external device support
• Dovetail mini-rail for helmet mounting (compatible with Rayvn Group modular bridge mounts)
• IP67 environmental rating; operates −40°F to +122°F
• 1.5 hours on single CR123A, 5.5 hours on dual CR123A or single 16650 battery
• Designed and assembled in the USA

Specifications

Frequently Asked Questions

Can I mount the Sidekick 640 to a helmet?

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.

How long does the battery last on a single charge?

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.

What's included in the package?

The Sidekick 640 comes with the thermal monocular, two CR123A batteries, a USB-C cable, lens cloth, soft carrying case, and the product manual.

Can I record video with the Sidekick 640?

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.