Note: Please note that 850NM is concealed to the naked eye. specification: Item Type: Handheld Red Light Therapy Device_x000D_Material: Aluminum alloy_x000D_Built in battery: Lithium ion battery 1200mAH (shipped with built in battery)_x000D_Application Description: 1-1: Light therapy effect ---- through physics, emitting 620 + 660 + 850NM light band (with He-Ne laser in the same band, deep penetration, penetration of the body with red LED and the optical effect of the red LED band (refers to the red after) light on the mitochondrial peroxidase activity increased, enhance cell metabolism and protein synthesis, promote local blood flow; and control the increase of infection. Features: 1Pain Reduction: Different from the ordinary red LED therapy equipment on the market, the red LED therapy torch can reduce pain, more functions, better results. 2Repair Skin and Lose Weight: The handhold red LED torch,15?30 minutes each time, is perfect for repairing skin, reducing pain, losing weight, etc. 3Reduce Inflammation: It can improve local tissue ischemia, reduce inflammation and swelling, reduce pain, relieve muscle spasm, and promote collagen production. 4Portable Lanyard: This red LED therapy torch has a lanyard design, the lanyard can be easily carried, suitable for use when out and about. 5Suitable Parts: Red LED therapy torch can be used on back, neck, shoulder, knee, hand and other parts to redece joint pain, muscle fatigue and soreness. PackageList: 1 x Infrared Physical Therapy Lamp 1 x Lanyard 1 x Battery Charger 1 x Storage Box