Not only does the DryGuy GreenHEAT 2 in 1 Heater provide up to 5 hours of cozy warmth for your hands, it also packs enough power to charge your phone on the go! This pocket sized heater is also incredibly eco friendly, reducing waste by eliminating the need for disposable hand warmers. . Temperature onoff switch offers two temperature settings: 111degF low and 120degF high. High capacity rechargeable battery provides 3 5 hours of heat per charge 3 hours on high setting 5 hours on low setting. 2 in 1 design also charges your mobile phone provides approximately 2 full charges for most smartphones. GreenHEAT fully recharges in 7 8 hours. Unit features charge, discharge, and short circuit protection. Dimensions: 3.5 x 1.5 x 0.6 in.. Weight: 4.7 oz.