You may USB heating warmer when you feel your hands freeze. We will recommend you this plug in hand warmer, which are made of durable material, and powered by USB to help keep you warm and comfortable while you are working near the computer under a chilled environment or in winter. Features - Material: Flannel. - Size: 30.00X14.00X10.00cm/11.79X5.50X3.93inch. - Voltage: DC 5V. - Power: . - Made of premium flannel material, and durable for use. - With USB cable, rechargeable over and over again, keep warmth. - for people who use computer to work or study for long hours in cold weather, such as office workers, students, game players, etc. - Perfect size to take anywhere in your bag, warm your hands fast and safely. - Stay warm in winter wherever you go. Smooth and comfortable to touch. Package list: 1 x hand warmer