... warmer could be used warm body, such as hands, feet, back, waist, shoulder, knee. BNA-01BNA-02BNA- ... warmer could be used warm body, such as hands, feet, back, waist, shoulder, knee. It could be ... 1. Warming on hands and feet. After switching on 5 minute, hold this product by hands, or press on feet.2. ... Warming or drying shoes. After switching on 5 minute, put this ...