Pilot Alumni Group HW-922B Black 5200 mAh Oval Design Hand Warmer (Collegiate Kentucky Wildcats) Slim design is easy to have on hand and both sides warm up to keep hands nice and toasty on even the coldest of days Rechargeable via AC adapter or USB with each full charge lasting approximately 5-6 hours Charges digital devices including mobile phones, MP3 players, digital cameras, and more Designed with aluminum casing for ultimate durability Two temperature settings range from 108F on low to 117F on high