<b>KARECEL Rechargeable Hand Warmer, USB Hand Warmers 5200mAh Portable Powerbank Electric Heater Pocket Warmer Battery Reusable Handwarmers, Best Gifts for Men and Women in Cold Weather Winter Outdoor Sports and Ski Gadgets</b> <br><br><b>Specifications:</b> <br>Output: 5V/2A <br>Input: 5V/2A <br>Capacity: 5200mAh <br>Charging time: 2-3 hours<br>Product Size: 10.4*6.3*3.6cm(4.1in x 2.48in x 1.41in)<br>Packaage Size: 13.5*8.5*4.5cm(5.31in*3.35in*1.77in)<br>Working Time: 4-8 hours (The lasting time depends on external temperature and heat settings) <br><br><b>How to use it?</b> <br>One button controls it all. Press and hold the button until the LEDs light up—it’s on! <br>Once on, Short press ONCE each, red-lights 3stars optional (Low/Medium/High temp). <br>Long press (4-5sec), power off. <br>Note: If short press twice, battery showing with blue-lights, and blue-lights shutoff automatically in 40sec. <br><br><b>Packing list:</b> <br>1* 5200mAh rechargeable hand warmer powerbank <br>1* USB charging cable <br>1* User manual <br>1* Cloth pouch <br><br><b>**Tips:</b> <br>--Please Keep away from water. <br>--DO NOT charging and heating simultaneously. <br>--Please stored in a cool dry place when not in use. <br>--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.