Philips bluetouch pain relief patch and upper back strap uses innovative blue light therapy with a dual effect it provides soothing warmth and stimulates the release of nitric oxide within the body to increase local blood flow and support the bodys natural recovery processes bluetouch patch contains 40 blue leds that create therapeutic light blue light delivers warmth and stimulates the bodys natural release of no both leading to an increased blood flow thus improving nutrient and oxygen s