Material: cotton, far- infrared heating film. Product voltage: 5V. Battery voltage: 3.7V.Temperature: 35-55℃. Battery capacity: 4000 mAh.Specification:Name: Remote Control Electric Heating SocksWeight: about 0.35KGMaterial: cotton, far- infrared heating film Product voltage: 5V Battery voltage: 3.7VTemperature: 35-55℃ Battery capacity: 4000 mAh The high temperature range is about 55℃, Red light The middle temperature range is about 45℃, Green light The low temperature gear is about 35℃, Bright blue light Usage time:High-level, about 5- 6 hoursMid-level; about 7- 8 hoursLow-level, about 10 hours Opening method: long press the power for 2- 3 seconds, short press the switch to adjust the temperature to meet the needs of different groups of people Packing List: Heating Socks* 1 Pair Battery*2 USB Charging Cable*1 Remote Control*1Notes: 1. Only sell main products, not other products.2. Since manual measurement is required, please leave a space of 1- 3 cm.3. Due to screen differences, the color may be slightly different from your expected color, please allow.Remind: After receiving the packaging, please check the packaging and the product carefully. If the received item is defective or has any questions, please contact us via email to resolve the problem. We will reply as soon as possible and do our best to meet your needs!