PROFESSIONAL RED LIGHT BELT: 660nm red light SAFE & LONG SERVICE LIFE: The front of the red lights is covered with a layer of transparent TPU film which is friendly to our skin and isolates sweat and oil from the skin. Includes 189pcs 660nm red light chips and 126pcs 850nm infrared light chips. FLEXIBLE & HANDS-FREE: The red light therapy belt sits comfortably on the body while sitting, lying down, or walking around. The hands-free design allows your hands to be free. The belt with remote control conveniently plugs into the USB port on your power bank, computer, laptop or a charging adapter into a wall outlet. Please note: use the red light therapy device less than 30 minutes at a time, you can enable the timer shutdown function BRAND NEW