Cozy Warmth: Electric heated insoles provide soothing warmth to keep your feet toasty even in the coldest conditions. Discreet Design: Low-profile, slim insoles easily fit inside your shoes or boots without adding bulk. Adjustable Temperature: Three heat settings (High/Medium/Low) allow you to customize warmth levels for optimal comfort. Long-Lasting Battery: Rechargeable lithium-ion battery lasts up to 6 hours on a single charge for all-day wear. (This product does not include batteries) Complete packaging: includes a pair of heated insoles and a 1.5-meter-long (59 inch) USB charging cable This heated insole can be cut to a thickness of 5mm. When using it, you can place the heated insole under the insole you usually use, so that even if the power is cut off, the foot temperature can still be maintained. After the feet have been heated and warmed up, disconnect the power supply, which can extend the use time of the portable power supply