This is the cordless device that uses low-level laser therapy (LLLT) and vibration massage to help relieve chronic pain. It emits red and infrared light waves at 650nm and 830nm that penetrate beneath the skin to increase blood flow and temporarily relieve joint pain and muscle aches. It also employs a vibration massage function that helps further aid discomfort and loosen muscles. Ideal for use on the back, shoulders, neck, feet, and wrist, the device secures to your body with the included adhesive patches or wearable band. The light therapy and massage actions can be operated independently or together. Automatic 30-minute shut off. Charges via USB; a full charge provides up to 60 minutes of power.