Celestron Thermotrek Handwarmer
Say goodbye to disposable chemical handwarmers. Celestron’s Thermotrek Handwarmer delivers up to 113° Fahrenheit of comforting, rechargeable warmth. Just plug it into the USB port on your PC or a compatible AC charger using the included cable. The 4400 mAh lithium ion battery provides up to an impressive 6 hours of continuous heat on a full charge. Built to take the abuse of daily use, with rugged aluminum construction and protective silicone endcaps.