【Working Principle】 660 nm red light reaches deep into the skin, stimulates cell repair and promotes blood circulation. 850 nm infrared raises tissue temperature, promotes blood circulation, relieves aches and pains, improves sleep and strengthens body resistance. 【Red Light Therapy】This infrared light therapy for arm selects the appropriate time according to different functions. Different hours are available for fat reduction, wound healing, skin rejuvenation, muscle and pain relief, chronic fatigue, etc. 【ON/Off Timer】 5 level of brightness for you to choose and supports 5/ 10/ 15/ 20/ 25/ 30mins auto shut off timer setting. help you speed up joint recovery and alleviates pain, great for sport injuries, neck and shoulder stiffness, sore back, muscle pain, and tissue repair. 【Wide Range Of Use】Can effectively relie-ve pa-in and muscle soreness after exercise or off work. It can be used on various parts of the body such as arms, knees, legs, etc. You can use it anytime and anywhere. 【Easy To Use】Experience fast relief wherever and whenever you need it with our easy-to-use heated arms wrap. Simply wrap it around your desired area 1-2 times a day for 20 minutes for best results.