USB heated insoles can operate from the USB port of a computer, laptop, Powerbank, or from a regular 5-volt mobile phone charger. You can connect the insoles to the USB port of a charger or computer and sit in your place and work, and when necessary, you can disconnect the wire and freely go about your business, when you return, connect again and your feet will be warm. Description: - USB heated insoles - Brown color - Size: 36 – 40 - Features: Fast heating, size can be cut, long service life, washable, prevent feet from freezing - Temperature after heating: 40-45 degrees - Connection method: USB cable (cable length 150 cm) Precautionary measures: 1. Disconnect the power supply in time after use to avoid prolonged heating and affect the service life of the heating panel; 2. The use of insoles by children should be carried out under the supervision of parents; 3. It is strictly prohibited to connect a power source with voltage more than 5V. Equipment: 1 x Pair of Heated Insoles (Battery not included) 1 x USB cable 1 x Trimming Size Chart