Feature:1. Wide Application: The physiotherapy device is very helpful for leg joint pain, back, shoulder, finger, knee, foot and neck pain.2. Portable: The physiotherapy device is lightweight and small, easy to store and carry, fits easily in your bag, and is suitable for travel use.3. Pain Relief: Near infrared light can penetrate deep into the skin and directly the pain point, so as to relieve pain more effectively.4. Strong Penetration: The red light therapy instrument has more concentrated energy and strong penetration, which is suitable for physiotherapy in small areas and concentrated areas.5. Optical Glass Lens: Equipped with a 30 degree optical glass lens, which can increase the irradiance of 120mW/cm at a distance of 1 inch, improve the efficacy of infrared light therapy, and shorten treatment time.How to Use:The course of treatment is generally two to three times a day, 15‑30 minutes each time. The light should be directed at the wound as much as possible. The closer the distance, the better, and it will end in one to four days.Specification:Item Type: Red Light Therapy DeviceMaterial: AlloyBuilt in battery: Li ion battery 2000mAhNote: 850NM is concealing light to the unaided eyeApplication description: 1-1: effect -----Through the method of physics, it emits light bands of 630nm, 660nm and 850nm (the same band as He-Ne laser, deep penetration, and red light penetrates the human body and The optical effect of the red light band (referring to the red color) increases the influence of light on the activity of mitochondrial catalase, enhances cell metabolism and protein synthes