Description: USB plug and play, fast heating, good thermal insulation performance, this hand warmer can be charged with a power bank. Unlike traditional electric hot water bags, this hand warmer does not contain water, is safe to use, and is portable when going out. This hand warmer is constructed of flannelette material. The length of this hand warmer is 31cm and width is 20cm. Suitable for home, office, bedroom, dormitory, etc. Item Name: Hand Warmer Material: Flannelette Features: Rechargeable, USB Plug Play, Waterless Design Power Supply Method: USB Rated Voltage: 5V Rated Power: 10W Temperature: About 50 Degrees Size Details: Size: 31cm x 20cm/12.2" x 7.87" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Hand Warmer