At a press of a button heat is delivered in seconds for up to 12 hours to this rechargeable hand warmer which also functions as a power bank. Whether you’re the outdoor type or not the USB hand warmer will keep you comfortable despite the cold. The convenient power bank feature also recharges your USB compatible device, so you can stay connected while outdoors. It is easy to operate with 4 heat settings from 40 up to 50 degree centigrade and has dual heat plates for 360 degree heat. The handwarmer is mains or USB rechargeable.