Description:The handwarmer has a built-in protection system with the function of short-circuit protection and overload protection to ensure safety during use or charging, anti-burn, and no radiation. Our handwarmer can heat both sides evenly and quickly. Features:Manual Preheat Mode: press and hold the button on the right side for 3 seconds to turn on the dual double-sided heating function and display the current temperature at the same time. Mobile power: press the button on the left to turn on the mobile power and display the power at the same time. Specification:Name: rechargeable hand warmerMaterial: PC+Aluminum alloyProduct size: 95*50*25mmProduct packing: 154*89*36MMComnture time: 3-6 hoursVoltage: 5V2ANvoltage: 10-15WTuering mode: USBProtent: 10000mAhNumber of gears: two gears (45 deg;/60 deg;)Product Net Weight: 130G/180GLproduct List:Hand Warmer * 1USB * 1