SMART APP CONTROL- The red light therapy belt is equipped with an exclusive APP, through which you can adjust the light intensity more precisely and set time,no the risk of burns. When you use the red light therapy belt for shoulder, using the adjustment buttons on the belt may be inconvenient. In this case you only need to open the APP to control the belt, very simple. RECHARGEABLE BATTERIES- The red light therapy belt is equipped with an exclusive 8.4V 24.4Wh battery with a high output power, which makes the red light shine more intensely, generating more energy and penetrating deeply into the skin to achieve the treatment effect.And you can walk around while in use without sticking to the wires. UPGRADED PRODUCTIONG PROCESS- To avoid some red lights from not working, we have added a layer of elastic sheet between the LED lights and the circuit board, so that it will not affect the product life under normal bending conditions. Besides, the life span of Led lights is about 50,000 hours, and each LED light is composed of two red lights and one near-infrared light, which is good for back, sciatica pain relief, wound healing, reducing inflammation. 660nm RED LIGHT and 850nm NEAR INFRARED LIGHT- Red light is absorbed into the skin and subcutaneous layer, promoting cell healing and collagen production, improving skin, relieving joint pain, and accelerating wound healing. Near-infrared light is absorbed deep into the skin.