This LED pain reliever produces safe infrared heat over a wide 3 1/2"-diameter area to stimulate blood circulation, relieve swelling in joints, and loosen tight muscles. Using technology developed by NASA to heal astronauts’ injuries, the infrared light therapy device emits waves from its 72 medical-grade LEDs (68 infrared and four red), which penetrate deep into tissue for lasting relief from muscle aches. A study at Children’s Hospital of Wisconsin in Milwaukee showed the LED technology reduced painful inflammation by up to 37%. More effective than heating pads that only treat just below the skin’s surface, this deep penetrating light therapy device can be placed on the skin or 1/4" above the skin and begins to relieve pain in as few as three treatments. The lightweight, brush-shaped design is easy to move around the body. Plugs into AC. 7 3/4" L x 3 1/2" W x 3 1/4" D. (5 oz.)