Comfortable hands free design: This red light therapy belt for body weighs 0.74 lbs and can be used hands-free at home. It comes with two power cords, one with adapter and one with USB interface. The power cord with USB is for power pack (power pack is Not included in the packaging). If you do not use power pack, we recommend that you use the power cord with adapter, which uses wide voltage DC 100-240 V, AC 5V2A, which is longer, safer and more applicable, also It can be put in a handbag. Two Professional Grade Led Light Therapy: 660nm red light (visible light) it can penetrate the skin epidermis, promote cell metabolism, repair damaged skin, 850nm infrared light (invisible light) it penetrates deeper than red light, can have a thermal effect on muscles, can accelerate blood circulation, Pain relief and relaxation of muscle tension. Safe And Natural, regain your health: Enjoy expensive light therapy in the comfort of your home, about three weeks, free your body from pain, age and injury! Great for sports injuries, neck and shoulder stiffness, back pain, muscle pain and tissue repair, this red & infrared light therapy can be used on multiple areas of the body. Recommended by professional doctors: Many professional doctors are also using this product and have achieved good results. The device has also obtained international certification. GREAT IDEA: Makes a thoughtful self-care for women and men.