This comfortable belt uses a combination 660nm red light and 850nm infrared light to deliver many powerful and rejuvinating red light therapy sessions. The belt can be used throughout the body and works uniquely well to address back and torso injury and chronic pain. As with all Redmedy devices, this belt can be used to yeild the many benefits of regular red light therapy use. This unit comes with adjustable intensity and a built in timer. It can be powered by a 5 volt power pack for portable use or a standard electrical outlet.