Product Features:4pcs high power LEDs, combination 4 wavelengths of 2PCS 630nm and 660nm deep red light and 1PCS 850nm near-infrared light,and the update one add an 940nm red light which can stimulate the muscles, increase blood circulation, effectively relieve pain.: It is like torch, portable.Comfortable and easy to useHow to Use: Target on back, near to face, abdomen, knee, and leg.4-20 minutes every time and do 2-14 times every week according to your body require.Keep at a distance of 1"-6".Specifications:Item Weight: 350gLED Quantities: 4pcsLED Lens: 30 degreeInput Voltage: 3.7VPower:12W Battery:18650 (Built-in battery)Frequency: 50-60HzLifespan: 50,000 hours Illuminance:120 mW/cm @ 1inch45 mW/cm @ 3inch25 mW/cm @ 6inch Package includes:1x Red Light Therapy Lamp(Built-in battery)1x Charging Stand1 x User Manual Attention please:1.Indoor use only, not water-proof.2.Infrared light is invisible to the naked eye so when using this bulb only half of the chips will appear illuminated.3.Due to individual differences, if not comfortable when irradiation, please stop.4.The red light therapy bulb come with batteries in the package.Features:4 BENEFICIAL WAVELENGTHS COMBINEDOur red light therapy bulb combined 4 specific wavelengths in the mid 630nm,660nm ,850nm and 940nm which have been proven to be particularly beneficial for the human body.This therapy light bulb with 4pcs High Power LEDs Chip, As the near-infrared light is invisible light, half of the infrared lamps chip will not emit light when the red light therapy device is working.RELIEVING PAIN OR SKIN-REPAIRING 630nm 660nm and 850nm these 3 wavelengths are the perfect comb of light therapy.As the red light doesn't penetrate as far into the skin, it is suitable for superficial treatment, like reduce wrinkles.while the near-infrared penetrates deep into the skin, direct to the pain point, and more effectively relieving pain.So it's very helpful for joint pain of the legs, muscle ache of the back, shoulders, finger, knee, foot,cervical soreness.EASY TO USE AND PORTABLEThis infrared light therapy lamp is portable .Just for airmail forbidden ,battery not include,you need buy it in your local place ,hope understand .itwill be work when you put in the battery and turn on the switch.Target any part of your body which with pain and start treatment.It is lightweight, so you not just use it at home and also in a traveling hotel, enjoy your light therapy at any time and anywhere.WELL MADE & DURABLE USEThis infrared light bulb housing made by 303 stainless steel material, durable, very durable to use.Without cooling fans, so there is no noise disturb you when you enjoy your light therapy, life Span 50,000+ hours.This infrared light therapy for pain is equipped with a 30-degree optical glass lens which improves the Irradiance 120mW/cm at 1 inches distance, which will improve infrared lamp therapy treatment effect, meantime shorten the time.100%SATISFACTION GUARANTEEPlease feel free to contact us whenever you meet any usage problem about this infrared light therapy for face and neck, we can provide you some necessary technical support, if you are not satisfied with your Red Light Therapy device, we will do our best for you ,no worry ,thanks