sherry Hand Warmers Rechargeable USB Hand Warmer Reusable 5200mAh USB Beverage Warmers Portable Heater Battery Hot Pocket Warmer Silver

Specifications: Output: 5V/2A  Input: 5V/2A  Capacity: 5200mAh  Product net weight: About 138g  Size: 10.5*6*2.8cm  Charging time: 2-3 hours  Working Time: 4-8 hours (The lasting time depends on external temperature and heat settings)  How to use it?  One button controls it all. Press and hold the button until the LEDs light up-it's on!  Once on, Short press ONCE each, red-lights 3stars optional (Low/Medium/High temp).  Long press (4-5sec), power off.  Note: If short press twice, battery showing with blue-lights, and blue-lights shutoff automatically in 40sec.  Packing list:  1* 5200mAh rechargeable hand warmer 1* Lanyard  1* USB To Micro USB Charger 1* User manual  1* PEVA carrying case  **Tips:  --Please Keep away from water.  --DO NOT charging and heating simultaneously.  --Please stored in a cool dry place when not in use.  --Put on Cloth pouch to avoid burns when they get too hot for skin contact especially say on the wrists or behind knees where skin is thinner and more fragile