Battery1inc Portable Double-Sided Heating Bank Hand Warmer & Rechargeable Power Bank Emergency Charger Unique design: pebble-shaped hand warmer &power bank 2-in-1; winner of Red Dot Design Award in 2015. Safe& warm: rubber covering around internal heating element prevents electric shock and ensures safety; double-sided and constant 122(50) heating warms your both hands. Radiation-free, green and healthy heat transfer. Built-in smart temperature control probe: it will automatically turn off when temperature exceeds 131(55). Fast charging and heating: 5V-1.5A large output features fast charging; built-in imported heating element features fast heating up to 122(50) in 30 seconds. Portable and convenient: small and compact appearance features portability; it also comes with a strap for easy carrying. Press switch button for 1.5 seconds to turn warming on and off. Warming will automatically turn off after working for an hour. 4 indicator lights keep you informed of the remaining battery. High capacity: 7500mAh capacity can give iPhone 6s 2~ charges, iPhone 5s 2 full charges and iPhone 6 plus 1.3 charges. It can heat up for around 4-5 hours after fully charged.