... back, waist, shoulder, knee. It could be helped for many aches, frostbite, rheumatism.2. Its temperature of radiation ... temperature.6. Safety in use, long life to last. There is no high temperature over 80, no ... , it is safety voltage. It can be used last over 10 years. Caution and no-no.1. ... switching on this product for 5 minute, and rub the parts that was chilblain last year for 10~30 minute each ...