Product Parameter Product Name: Hand Warmers Battery Type: Polymer Lithium-Ion Battery Battery Capacity: 2000mAh * 2 Type-C Input: 5V/1A Product Size: 88 * 47.8 * 36mm Weight: 120g 3 Heat Temperature Levels: Level 1: 104°F-113°F (40°C-45°C) Level 2: 113°F-122°F (45°C-50°C) Level 3: 122°F-131°F (50°C-55°C) Product Use Instructions About Charging Operation Select the original charging cable to charge the hand warmer by using a AC charger or PC USB port. When the LED indicator begins to flash, this hand warmer is charging. When being fully charged, the 3 LED indicators are always on. About Heating Mode The power button has the functions of turning on/off and switching three temperature levels. When you need to check the power, double click the power button and the LED indicator lights up to show the current power. 1. The heating function cannot be turned on when the hand warmer is charging. 2. When the heating function is enabl