The Redline Back Wrap offers BOTH Red Light and Near Infrared light therapy. It offers 1304 LEDs that each contain a 1:2 ratio of 660nm:850nm therapy. With multiple settings you can provide custom relief for your horse. The diodes are covered with a clear PVC plastic lining for easy cleaning. The Redline Back Wrap operates by a 12v plug or can be used with an external battery. External battery is INCLUDED with purchase.