PROFESSIONAL GRADE LED LIGHT THERAPY: 660nm red light therapy is known for its ability to improve skin problems. 850nm near-infrared light reaches deeper tissues, helping muscle repair and improving joint stiffness. Pulse mode quickly takes effect, allowing you to immediately experience the magic of red light.10Hz and 40Hz two frequencies, provide faster pain relief with pulsed light during pain. Safe and natural, Outstanding effect: Enjoy expensive phototherapy at a comfortable home for about three weeks to protect your body from pain, making it perfect for sports injuries, neck and shoulder stiffness, back pain, muscle pain and tissue repair, aging, and injury! Accelerate postoperative wound recovery, alleviate soreness, improve sleep, and enhance body resistance. COMFORTABLE, HANDS-FREE DESIGN: This red light therapy belt for body weighs 0.6 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. (THE POWER PACK IS NOT INCLUDED IN THE PACKAGE). 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.