Here's a hand warmer power bank that not only serves as a charger for your mobile devices and other gadgets but can also keep you warm with a choice of 3 different temperature levels. Made of environment-friendly ABS and aluminum alloy with frosted finish. With NTC temperature control sensor that detects and automatically stops overheating, and MCU integrated temperature control which controls the output current to control temperature. Specifications: Input: DC 5V/2A Output: DC 5V/2.4A Charging time: 3-6 Hours Use time: 6-10 hours Heating power: 3.6W Temperature gear: 3 gears Heating temperature: 40, 50 & 60 Celcius / 100, 120, & 140 Farenheit Heating piece: adopting bi-directional synchronous heating combination (unilateral power 5.0W, Heating wire working voltage 5V/1A-1.9A) USB-A output(5V/2.4A, 10W), using intelligent switching, (when working with heat, USB-A port overload protection without output) DC 5.0W vibration motor With NTC temperature control sensor (overheating automatically stop heating) MCU integrated temperature control (controlling the output current to control temperature)