The ultimate astronomy accessory!

Keep your hands warm and all your portable electronics charged up when you're at your favorite observing site. This handy 2-in-1 accessory features an internal 4400 mAh battery. You'll get either 6 hours of continuous heat (up to 113 degrees Fahrenheit) or a full charge for your smartphone.

Unlike single use handwarmers, ThermoCharge can be recharged and reused again and again. Keep it in your gear bag for every observing session, then just recharge it at the end of the night via the mini USB in port. And--unlike chemical handwarmers--it's completely scent free.