"Celestron Elements ThermoTrek Brand New Includes Two Year Warranty, The Celestron 48010 is a simple yet extremely useful piece of equipment for hunters
One button, two LEDs (charging and power), and a mini USB charging port.The Celestron ThermoTrek hand warmer is rechargable, reusable, and puts you in control. Sure, you get 6 hours of constant use, but you can easily stretch that out by turning it off once warm. We can see how six hours could easily turn into ten. Pair it with the Celestron InfiniSun solar panel, and you have unlimited time.The 4400 mAh lithium ion battery provides up to an impressive 6 hours of continuous heat on a full charge .Just plug it into the USB port on your PC or AC charger using the included cable. The rugged aluminum construction and protective silicone caps make ThermoTrek perfect for cold weather excursions like cross-country skiing and mountaineering. 48010 Features: Battery : Rechargable lithium ion @ 4400 mAh, Input : 5v - 900 mAh, Charge time : 5 hours, Use time : 6 hours with fully charged battery, Charge cycles : 500, SKU : 48010"