ITEM NAME:1PC Rechargeable Electric Hot Water Bottle Hand Warmer Heater Bag for Winter 3C Features: 1. Automatic temperature control, Avoid overheat 2. Disposable water injection, permanent use 3. Voltage: 220V,450W, 50Hz 4. According to the different environment temperature, the use of time are also different Specification:.Disposable water injection, permanent use.