... time any where(It is better to use it 20min a time )day use .feature: high grade imported material:no ... , Wear on your knees 2.and equipped with a few COINS, massage, acupuncture magnet 3.mineral coating ... decide the length of wear, generally recommended to use twice a day, each with 20 to 50 minutes, ... bathroom can also be used, but heat needs a longer time.Package informationsize:51*43*49cmpcs/carton: ...