The Horseware® LED Red Light Therapy Leg Wrap's 110 LEDs use a combination of different light wavelengths to target both the dermal layer and deep tissues. 660nm red light targets the surface, while 850nm infrared light penetrates deeper to reach soft tissues. Flexible, sturdy neoprene outer. Built-in battery with USB charger for easy, cord-free use. 4 elasticated velcro straps for adjustability and secure fit. Features 15 minute timer and pulse function. Harnessing the power of red and infrared light, Horseware LED Therapy uses advanced LED technology and a combination of different light wavelengths to offer targeted support for various areas, including the skin and deeper tissues. Red and infrared light penetrate the skin and are absorbed by mitochondria - the energy powerhouses of cells. This stimulation enhances cell function, repair and activity which may contribute to overall well-being. The 660nm red light targets the surface, while the 850nm infrared light penetrates deeper to reach soft tissues.?