Specifications:    USB power or power adapter is practicable. When the gloves are first turned on, it will take one to three minutes to warm up.   You could send the hand warmers to your family or friends for Christmas gift or birthday present. Because it could keep feet cozy and warm.   Made of soft acrylic fiber, the heated gloves are safe and comfortable to wear.   There is one size, it is suitable for most of the people. In a very short period of time, the temperature can be about 42 degree, which is very warm for human body.   It is great for soothing cold, tired or aching feet and can be applied to various occasions, such as office, dormitory, home, etc. A necessity for Winter.      Item Name: Hand Warmer   Material: Acrylic Fiber      Voltage: 5V   Gender: Unisex   Features: Anti-slip, Warm, Soft   Power Type: USB Powered (Included Heating Pads)   Size Details:    Size: 16cm x 12cm/6.3" x 4.73" (Approx.)      Notes:    1. Due to the light and screen setting difference, the item's color may be slightly different from the pictures. 2. Please allow slight dimension difference due to different manual measurement. 3. Just open the inside of the glove, take out the heating piece inside, then it becomes a lightweight glove, and can be washed. When using it again, make sure the gloves are dry. 4. Please check if the USB port is connected well when using it for the first time, otherwise it may affect the heat. The maximum heat temperature is 42 degrees. 5. When not in use, please pull out the power supply in time to avoid prolonged heating.      Package Includes:    1 Pair of Hand Warmers    1 x USB Cable