Digital Display USB Hand Warmer

Both faces of this hand warmer heat up through an aluminum sheet that spreads warmth evenly rather than concentrating it in one hot spot. A small digital display on the front shows temperature and remaining charge, so there's no guessing when it needs to go back on the charger. Power comes from a lithium battery, rated at 5V and 5W, charged over USB like a phone rather than disposable hand-warmer packets that get thrown away after one use. It comes in two models, N25 and N20, and in black, white, green, or pink. A single unit weighs about 260 grams. Simple to use. Press the button, wait a moment, and both sides warm up together for a walk, a commute, or sitting at a cold desk through winter.