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Armasight

Armasight Sidekick 640 Mini Thermal Monocular with Armacore 640 Thermal Core, 3-Button Control, Compass, and Image Detail Enhancement (Gray)

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Arrives Monday, Feb 23
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Features

  • Smallest Monocular: The Armasight Sidekick 640 is the smallest fully multi-functional 12-micron 640 thermal imaging monocular on the market
  • Fast Frames: This unit boasts a fast 60Hz frames for smooth operation and industry-best, outstanding visual acuity, based on Armasights Iron Wolf thermal technology platform
  • Lightweight: Weighing under 250 g, the Sidekick can be used as a handheld mini-monocular or can be headset and helmet-mounted utilizing the built-in mini-rail for hands-free operation
  • Crisp and Clear: The high definition 1024768 OLED display provides a crisp image, with iconography providing key information
  • Easy to Use: The Sidekick utilizes simplified 3-button controls that allow for easy manipulation in the field and offers one-touch in-unit video recording to capture all of your experiences

Description

The Armasight Sidekick 640 is the smallest fully multi-functional 12-micron 640 thermal imaging monocular on the market. This unit boasts a fast 60Hz frames for smooth operation and industry-best, outstanding visual acuity, based on Armasight’s Iron Wolf thermal technology platform. Weighing under 250 g, the Sidekick can be used as a handheld mini-monocular or can be headset and helmet-mounted utilizing the built-in mini-rail for hands-free operation. The high definition 1024×768 OLED display provides a crisp image, with iconography providing key information. The Sidekick utilizes simplified 3-button controls that allow for easy manipulation in the field and offers one-touch in-unit video recording to capture all of your experiences. It is available in a Gray color. Features The Armasight Sidekick 640 has a 1-hour runtime on 1 CR123A battery at 20-degree C. It features Image Detail Enhancement. You can record videos and capture images through it. You can use the USB port to stream videos. A USB-C interface is included for external devices. The Sidkick 640 also features a compass. A battery status indicator shows how long your battery will last before the next charge. The Sidekick 640 has a ULTEM composite body and an ergonomic design. It is made and manufactured in the USA.

Brand: Armasight


Color: Gray


Style: Hunting


Sport: Hunting


Item Weight: 0.53 Pounds


Material: Magnesium Alloy


Magnification Maximum: 1 x


Objective Lens Diameter: 19 Millimeters


Magnification Minimum: 1 x


Compatible Devices: Headset


Brand: ‎Armasight


Color: ‎Gray


Style: ‎Hunting


Sport: ‎Hunting


Item Weight: ‎0.53 Pounds


Material: ‎Magnesium Alloy


Magnification Maximum: ‎1 x


Objective Lens Diameter: ‎19 Millimeters


Magnification Minimum: ‎1 x


Compatible Devices: ‎Headset


Mounting Type: ‎Helmet Mount


Night vision: ‎Yes


Eye Relief: ‎15 Millimeters


Model Name: ‎Sidekick 640


Manufacturer: ‎ArmaSight


UPC: ‎810081911672


Item Package Dimensions L x W x H: ‎10 x 5.51 x 4.41 inches


Package Weight: ‎0.66 Kilograms


Item Dimensions LxWxH: ‎5.7 x 1.9 x 2.6 inches


Brand Name: ‎Armasight


Warranty Description: ‎3 Year Warranty


Suggested Users: ‎unisex-adult


Number of Items: ‎1


Part Number: ‎TAVT66MN9SIDE101


Included Components: ‎Sidekick 640 Mini Thermal


Date First Available: December 6, 2023


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Monday, Feb 23

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews

    • A Worthy Successor to the Breach Monocular
I ended pulling the trigger on a Sidekick 640 for a little over $2,500 during the Labor Day sale, which is about $200 less than what I picked up a Breach for back in 21. It's a bit bigger and heavier than the Breach, and the ergonomics are different. I'm right handed and tend to mount these on my dominant eye, but the controls feel like they are better suited to left handed operation. Nothing bad, just have to get used to it. Buttons are stiff, same as with the Breach, but I expect they will give more with time. The FOV is night and day. I don't feel the need to have to constantly pan back and forth to ensure something isn't creeping in just out of sight, it just feels like a natural view. I like the objective lens focus adjustments, you can see when it's dialed in when the small details suddenly appear (blades of grass, tree bark patterns). Only issue I have is that objects inside 6-10 feet are not able to be focused like you can with a standard NVG, but since this is a detector I get the limitation. I am guessing the fixed objective lens on the 320 actually is clearer closer up than the 640, since the Breach can make out smaller details up close that the 640 cannot. I like that pallets can be selected with a single button push, but I don't like having to cycle through the pallets to find the one I want. Since the forward button and rear button have dedicated single press functions you can't go backwards to a pallet once you've passed it but must instead cycle back through all of them again. Zoom functions the same way with the same button, so you have to zoom all the way through until you reset back to zero. For the pallets it is jarring to go Sepia > White Hot > Black Hot > Predator Vison (OMG Eye fatigue) > Target (Black Hot with Red Overlay). I think it would be much nicer to have the dedicated pallet selection button be a user preference feature (cycle through pallets you select from a block check feature or something) and then a separate main options page where you can choose to display a specific pallet. The device uses 3 buttons, so options are limited, and everyone has their own preferences so I cannot complain too much. The options they do leave up to the user are pretty great for making the monocle perform in your specific environment. I love being able to grab one of their default settings and then going in and tweaking it until I dial in what I am looking for. It's great to be able to see how the adjustments add to or take away from what you are trying to make the monocle display. I prefer technology function the way I expect it to, I am not a fan of having to adjust anything, but thermal is just one of those areas where you have to pull out of your comfort zone to get the best out of it. I was initially underwhelmed with the video quality and refresh rate. The Breach by comparison has zero noticeable lag as you move your head to look around, in fact it is almost as close as you can get to the pass-through of a NOD. Being 6 years in the future I wasn't expecting a 60hz refresh speed on a micro HD screen to have any noticeable lag. As long as there isn't a hardware bottleneck somewhere in the design this can be fixed through firmware updates, so I expect that to improve. I'm not bothered by it anymore since there is less drastic head movement with that wide FOV, so unless you are using this to navigate it shouldn't even phase you. I can see someone getting this thermal, turning it on in a neutral thermal environment like their house, and feeling like they were cheated......ya gotta go outside and let the device show you what it can do as you adjust the settings to fit your preferences. After registering with Armasight I was able to update to the most recent firmware (5095 as of 3 SEP 24). When I got the device it was on firmware 5090, so like others have said Armasight is actively improving the device. The changes between when I first started using the thermal and two days later with the firmware update were noticeable (clearer video when panning/moving). I do not mind being a live Beta tester for a company working this hard to improve their device. What else.... - I love the extended battery tube was included so someone doesn't try to charge me $100-150 for one. If you are using 16650 batteries already, likely Orbtronic ones, they are a tight fit. You have to unscrew the extender to remove them. I've asked Armasight if there was a specific brand they were using for testing since no other device has issues fitting an Orbtronic, I'll pass along what they tell me. -The objective lens cover isn't going anywhere once it's on, but if you have the battery extender on you have to work a little bit to get the cover off since one of the edges fits in the gap between the extender and the lens. No big deal, just be aware of it since the inclination is to use the cover's strap to leverage it off and it could snap if it gets caught between the battery extender. -The little detent where you lock in your objective lens cover to stow it while the thermal is in use is a nice feature that works. It's good design I like to see. -The USB C cover is going to come off, either from you removing the objective lens cover or adjusting the lens. It has the same little knob as the lens cover and it protrudes just enough to get in the way. I am going to pop it off and replace it with a low-profile USB C port cover for phones that come in packs of 20 from Amazon and see how that works. -The rear eyecup that comes with the Sidekick is good quality, but it has some grip to it. You're going to want to add a microscopic bit of lubricant so it can spin freely. On mine trying to adjust the eyecup takes the diopter adjustment with it so I am forced to hold the diopter in place and pull/twist the eyecup into position. I don't know if I am just nitpicking since the one on my Breach free-spins like a top and has to be adjusted every time I put on the monocle. At least with the Sidekick you set it up once and don't need to move it again haha. -Popped a MOD Armory dovetail adaptor onto the MUM rail so I could use my Wilcox SKEET-IR modular bridge component and its IPD adjustment. I own the Wilcox MUM bridge which has a beautiful mini-rail coupling feature but is nearly unusable for thermal's unless your IPD matches the bridge as-is. Wilcox is heavier but stable and rock solid. Running this on a Crye nightcap and it's an easy wear. Something important to note is that because of the FOV of this unit and the details it can see, this would be the first thermal I could see navigating with if two units were bridged. The detail you can see outweigh the dangers usually associated with navigating with thermals, namely the inability to see holes/depressions in the ground. Paired with another Sidekick 640 I could easily see the surface contours beneath me, and navigate successfully. All in all I like the Sidekick 640 and I know it is helping me see and detect further than anything else in my kit. I'd recommend it to anyone looking to start out in thermal for basic defense and protection, and for exploring the night safely. ... show more
Reviewed in the United States on June 15, 2025 by J. C. Little
    • Works as intended. Dual-band set-up with Ravyn Group Bridge
Review Image by JD Ferguson JD Ferguson
Tricky to get the firmware to work just right. Follow all directions and reformat after installing latest version of firmware.
Reviewed in the United States on December 21, 2025 by JD Ferguson JD Ferguson
    • Just do it. Better than duals and a COTI
Review Image by Mike L. Mike L.
Review Image by Mike L. Mike L.
Review Image by Mike L. Mike L.
Review Image by Mike L. Mike L.
Extremely lightweight monocular. Highly recommended for a thermal imaging unit optimized for helmet-mounting. Easily paired with a PVS-14 for true fusion. Cannot recommend the Rayvn Group bridge highly enough if pairing with a PVS-14; the IPD adjustments on Rayvn bridge are above and beyond what you would get with any other option on the market. Along with the internal software adjustments, you can achieve legitimate fusion. The resolution is excellent, and the target mode is absolutely exceptional. Coming from strictly i2 technology, the ability to see in absolute darkness without supplementary lighting illumination is worth the cost of entry alone. The variety of color palettes available is extremely useful, and the sepia mode is a low-key standout. If I could come up with any negatives, it would be that, being digital technology, implementation of a green and blue color palette for seamless fusion with i2 devices should be a relatively simple process for the manufacturer. The menu system is intuitive, easy to use, and does everything you could ask for as an end-user. Build quality is excellent. I am consistently getting the manufacturer’s published specs on battery life, and the addition of a goal zero Venture 35 is getting multiple nights of use off a single charge. I’d recommend picking up a 1.6’ USB right angle cable, for optimal results with an external battery pack. The lens cap is great, and has a self-stowing feature, but I would recommend replacing with a Butler Creek MO20010, for ease of stowing. I can not recommend the Sidekick 640 and Rayvn Group bridge highly enough. Coming from running dual i2 Binos to a Sidekick 640 and PVS-14 there is no way I would ever go back to running duals. Even with an E-COTI on dual tubes, the Sidekick 640 and PVS-14 fused on a Rayvn bridge is the superior option. ... show more
Reviewed in the United States on October 22, 2025 by Mike L. Mike L.

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