Sidekick 640 Mini Thermal Monocular

(3 reviews)
Current Stock:

The Sidekick 640 is the smallest fully multi-functional 12-micron 640 thermal imaging monocular on the market. This unit boasts a fast 60Hz frame rate for smooth operation and industry-best, outstanding visual acuity, based on Armasight’s Iron Wolf thermal technology platform. Weighing under 250 grams, the Sidekick can be used as a handheld mini-monocular or can be headset/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.


  • Multiple Color Palettes
  • Intuitive 3-Button Control
  • 1.5h Runtime on 1 x CR123A Battery, 5.5h on 2 Batteries with Included Battery Extender
  • Image Detail Enhancement
  • Dovetail Mini-Rail Included for Helmet Mounting (with Optional Mount)
  • Works with Rayvn Group Modular Bridge Mount for Helmet-Mounting with PVS-14, MNVD, or Second Sidekick (sold separately)
  • Ability to Shift Thermal Image to Collimate Sidekick Image with NVD when Bridged
  • Video Recording & Image Capture
  • USB Video Stream
  • USB-C Interface for External Devices
  • Compass
  • Battery Status Indicator
  • ULTEM Composite Body and Ergonomic Design
  • Designed and Assembled in the USA from U.S. and Global Component

Package Includes

  • Sidekick 640 Mini Thermal Monocular
  • 2 x CR123A Battery
  • USB-C Cable
  • Lens Cloth
  • Soft Case
  • Product Manual
Detector Type:
ArmaCORE™ 640x480 12um Thermal Core
Refresh Rate:
60 Hz
Thermal Sensitivity:
NETD < 40mK
Detection Range:
709m On a Human Sized Target
Recognition Range:
177m on a Human Sized Target
Identification Range:
111m on a Human Sized Target
Eye Relief:
Field of View:
24.16° x 17.37°
Optical Magnification:
Digital Zoom:
1x - 4x
XGA (1024 x 768) OLED
Active On-Screen Graphics and Iconology
Lens System:
F/1.00; 19mm manual focus
Diopter Adjustment:
-5 to +5 dpt
Power Supply:
1 x CR123A or 2 x CR123A / 1 x 16650
Battery Life:
1x / 2x CR123A - 1.5h / 5.5h at 20°C (68°F)
Low Battery Indicator:
4 Hours of Video
Image Processing:
Digital Enhancement
Environmental Rating:
Operating Temperature:
-40° C to +50° C (-40° F to + 122° F)
145 x 50 x 65mm / 5.7 x 1.9 x 2.6in
242g / 0.53lbs
3 years w/ registration


  • 4
    640 sidekick

    Posted by Brady on Apr 21st 2024

    I've owned this now for about a month and have been putting a lot of time on this. The picture is good both day and night (beauty of thermal), refresh rate is great, and the ability to adjust the picture to Fuze with a bridge mounted pvs14 is awesome. The color palettes each have their strengths based on your conditions however I do have an improvement. When using to get pictures or video off the device, the device will often freeze. I think the cap type could also be better as the current offered one is not great for the field. The device is truly awesome and provides a crisp clear image. I'm sure additional firmware updates could help clear up my small issue. For what I use it for, I'm pretty pleased with the pricepoint

  • 5
    Sidekick 640

    Posted by Robbie Hoff on Jan 14th 2024

    I'd like to provide some quick feedback for Armasight on the Sidkekick 640. Waited a long time to get this little beauty but I think it was worth the wait. The unit is very light weight and pairs well with my helmet. I ran it last night for the first time and while the hogs I was trying to kill did not show up, we did notice a coyote coming across the neighbors pasture. If I had not had my sidekick on my helmet and been scanning it with it I would never have seen him coming. The 640 resolution is outstanding, even at 1x I am able to identify heat signatures the size of a coyote out to 150-200 yards and make positive IDs at 100-150. On the surface that might sound terrible but it's not, the field of view on this unit is enormous and they have to squeeze all that data into a very small screen. In all the coyote made a wide sweep and crossed the fence onto our side. Boom! Coyote down. The Sidekick really shows its strength by providing excellent situational awareness. Can't kill them if you can't see them. Screen resolution and function are great, buttons are stiff but I think they'll get better over time. My 8 year old zeus had hard buttons at first and that improved with time. Battery extender is a hit, ran it over 3 ours last night, no issue. There are a few little bugs in the software, very small and the unit catches up but once it's set there are no issues at all. I'm very pleased with the quality and performance. Highly recommend it for anyone needing to scan continuously then fold it up and go to the gun. I think 5 stars is appropriate as there are a few little issues, they do not negatively affect the performance of the unit. All in all, Kudos to Armasight, a very well made unit that performs well above it's price point. I'm very impressed.

  • 5
    Awesome Quality and Functionality

    Posted by Rob D on Dec 29th 2023

    I have been waiting for months for the Sidekick 640 and finally got it in hand. To say that I am thrilled with it is an understatement. I love the wide FOV and the features it has. Super small and compact exactly what I needed. The support from Armasight has also been fantastic, I had a few questions on how to work some functions and they walked me through it. I am really happy with my purchase.