Item Type: Physiotherapy Lamp Material: Aluminum Alloy Power: 9W Weight: Approx. 314g / 11.1oz Product Size: Approx. 12.5x2.5x2.5cm / 4.9x1.0x1.0in Light Wavelength: 630nm +660nm+850nm Power Supply: 1 x 18650 polymer lithium battery 1200mah (included) or 3 x AAA battery (battery not included, battery holder included) Lifespan: 20000 hours (long-term repeated use has a good health effect on human health) Principles of Phototherapy: The device physically emits a light band with a wavelength of 630nm/660nm/850nm (same as the light band of He Ne light), using red light to penetrate the human body and produce the optical effect of the red light band (i.e.: after red light is irradiated, the catalase activity of mitochondria increases, promotes cell metabolism and protein synthesis, promotes local blood circulation, controls infections, and increases. Applicability: 1. For soft tissue injuries, burns, puncture wounds, other wounds, and postoperative wounds, 2-3 times per day, 7 days as a course of treatment, 15-30 minutes/time. 2. For arthritis, periarthritis of the shoulder, lumbar muscle strain, prostatitis, cervical spondylosis, 2-3 times/day, 15 days.