*USB CHARGING DESIGN: From 95F to 122F and 4 classes timing from 10 to 30 minutes.Powered by PC, power bank, USB adapter. Heating temperature and time can be adjusted by controller, base on your requirement. 45-50C under 20mins can make your eye feel the best. *MAIN FUNCTION: Stimulate the blood circulation u0026 relax the regional muscle to eliminate the inflammation swelling,keep warm, massage muscle, relieve fatigue, improve blood circulation, eye cover sleeping mask for woman u0026 men,Say goodbye to eye bag, black eye. *REMOVABLE AND WASHABLE: Compared with disposable hot steam eye mask, This heating eye mask is reusable and environment friendly. Cover is made of 100% cotton, comfortable, removable and washable. Really a heathy and helpful eye protector. *ERGONOMICS DESIGN: Ergonomics design eye mask well conforms to the face and fits over the eyes. Heating eye mask fits all head sizes with an adjustable pain-free head strap. *HEALTHY u0026 CONFORTABLE: Heating eye mask a good choice for you go into deep sleep at home, take a rest for eyes at office, enjoy yourself on travel and have in the hotel,dissolve away the day's stress, give eyes a super Spa.