Want more warmth than mere gloves alone can provide? Fight the winter chill with these awesome hand warmers. Whether you’re watching a game, camping or hiking, spending time outdoors, or just have cold fingers, a hand warmer might be what you need to keep your digits nice and warm. With hand warmers that last for 4-8 hours (8 hours for low temperature). And the hand warmer has a USB port so you can charge electronics while also warming your hands, we’ve got a hand warmer for everyone. Product Features Charging time: 2-3 hours Working Time: 4-8 hours (The lasting time depends on external temperature and heat settings) Double-sided and 3 heating warm settings: 104~113℉ (40~45℃), 113~122℉ (45~50℃), 122~131℉ (50~55℃) Product dimensions: 4 x 2.3 x 0.8 In Weight: 4.7oz /133g Tips: Please Keep away from water, and do not charge and heating simultaneously; Please store in a 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 the skin is thinner and more fragile. Package List: 1 x 5200mAh rechargeable hand warmer & power bank1 x User Manual 1 x Micro USB cable 2 Years warranty