【Why the USUIE】Do you have knee pain, joint pain in your hands, neck pain, etc.? USUIE red light therapy device emits wavelengths of 660nm and a combination of 660nm and 850nm. It can be used for the back, neck, shoulders, knees, hands and other parts to relieve joint pain, muscle fatigue and soreness. It is the best choice for you to return to health! 【How It Works】Red light can penetrate the skin surface and be absorbed by the mitochondria in the cells, which improves the activity of mitochondria and releases more ATP, peroxidase, protein and other nutrients, which can increase cell metabolism and promote the repair of cell tissues; infrared light can penetrate deep into the tissues and bones, producing a thermal effect that increases blood circulation, relieves pain and relaxes muscles. 【More Effective】After professional testing, the irradiance of USUIE Red Light Therapy device is 181mw/cm² in one inch and 68mw/cm² in three inches, compared to competing products on the market, USUIE's products are more effective, buy it now! 【Easy To Use】USUIE provides customers with an easy-to-use octopus holder, completely freeing your hands. Being small and light, it can be conveniently packed away and carried around in the storage bag that comes with it. TYPE-C charging interface, fully charged can be used 13 times, will not be affected by the charging cable, whether at work or at home, or in the outdoors, you can enjoy the red light therapy anytime, anywhere! 【Best Gift Choice & Warranty】 The device helps users stay healthy with a beautiful product design and a variety of color styles to choose from. High-grade packaging, as the best gift for family and friends. If you require any further information, feel free to contact us. We will reply you within 24 hours. It can be returned for a full refund within 180 days of purchase.