1. 9 Zone heating Powered by the 5V USB interface, compatible with most mobile power sources, it can heat up within 3 seconds. 2. Comfortable and smooth to the touch, the warmth lasts throughout the winter without the need for a thick coat.3. hree heating settings (high, medium and low) can be adjusted at the push of a button. Helps promote blood circulation and relieve muscle soreness in winter. It is very suitable for people who often have bone pain in cold or rainy days. 1. 9 Zone heating Powered by the 5V USB interface, compatible with most mobile power sources, it can heat up within 3 seconds. 2. Comfortable and smooth to the touch, the warmth lasts throughout the winter without the need for a thick coat.3. hree heating settings (high, medium and low) can be adjusted at the push of a button. Helps promote blood circulation and relieve muscle soreness in winter. It is very suitable for people who often have bone pain in cold or rainy days.