Even if you don’t suffer from poor circulation or arthritis, chilly fingers will love curling around this pebble-shaped USB hand warmer. Double-sided for twice the heat, it warms up in seconds with 3 heat setting: 35°C, 45°C, 55°C, and stays warm for 8 hours. Wrapped in a soft drawstring carry case (included), it’s great for the outdoors, and includes a built-in power bank for charging USB-compatible devices. USB cord L2.8cm (included). W5.9 xD2 xL10.3cm.