Note: A 2600mAh battery is built in the device, to protect the battery, the device cannot be turned on while it is charging, please remove the charger to use it, each charging time please charge continuously for 2-3 hours. Combining 808nm near infrared and 650nm red light, this device effectively targets deeper tissues and surface areas for optimal pain relief and healing Red Light Device for BodyPain Relief, Infrared Light for Joint, Muscle & Tissue with LED Display Timer Control Red Light Threapy 14 * 650nm + 3 * 808nm Infrared Light Therapy for Neck Pain Handheld Red Light 650nm 808nm Handheld Powerful Cold Red Light Device For Joint And Muscles Reliefwith LED Display, Near Infrared Light Machine Multi-Speed Regulation With Pulse Function(808nm&650nm Red Light Therapy Belt ( Please wear the glasses before operated) What Is Red Light Therapy? Red light therapy is a treatment that may help skin, muscle tissue, and other parts of your body heal. It uses low levels of red light to target your skin and cells Use tips: It is recommended to use the device 10-15 minutes each time, hover the handheld red infrared light device for the body over the skin, at a distance is about 0., 5-1., 2 inches and moved slowly. The heldhand red light device has 14 * 650nm + 3 * 808nm LED light, the three beams of 808NM are invisible.