eature: 1. The use of red light therapy can promote wound healing and relieve pain. 2. The wavelength is 630‑660nm, which can penetrate deep into 10‑30mm. 3. It can be adjusted in low, medium and high three gears to meet different needs. 4. This product has a timer function, you can set the timer 15/30/45 minutes. 5. Using USB interface, 5V power supply, easy to use, no electricity, no magnet. 6. This is a phototherapy device based on photochemical action and hot compress therapy. Its main function is to resist inflammation and reduce swelling. Specification: Item Type: Knee Red Light Therapy Device Size: Approx. 28.5 x 16cm/11.2 x 6.3in Light Wavelength: 630nm + 660nm Working Temperature: 30-50℃ Voltage: DC5V Rated Power: 2-6W USB plug-in use Working Current:> 1000mA Maximum Power: 5W-12W 20000 hours, long-term repeated use, has a good health care effect on human health Principles of Phototherapy: The device physically emits a light band with a wavelength of 600 to 700 nanometers (the same light band as He-Ne light), and uses red light to penetrate the human body and produce the optical effect of red light (that is, after red light is irradiated, The activity of catalase in mitochondria increases, enhances cell metabolism and protein synthesis, promotes local blood circulation, and controls infection and increases. Principles of Hot Compress Therapy: The large amount of heat generated during use, the temperature may reach 30~45℃ (adjust according to your own adaptability.) According to the combination of heat and red light, apply heat to the skin and skin. Other body parts promote blood circulation to achieve therapeutic effects. Scope of Application: Soft tissue injuries, burns, stab wounds, other wounds and post-operative wounds, 2-3 times a day, 7 days as a course of treatment. 15-30 minutes/time. Arthritis, scapulohumeral periarthritis shoulder, lumbar muscle strain, prostatitis, cervical spondylosis, 2-3 times a day, 15 days as a course of treatment. 15-30 minutes/time. Method of Use: contact and non-contact. Non-contact type: The device has a certain distance from the skin (usually no more than 30 cm). It is suitable for skin, but not for broken skin. For example, trauma and wounds after surgery can just be treated by light therapy. Contact type: Put the device on the skin to perform phototherapy and hot compress effects on the skin. Specific Operation Method ①: Make sure that the device is aimed at treatment site (if you do not know where treatment site is, please consult a doctor. When using it, ensure the correct treatment site, otherwise it will affect treatment effect.) Make sure that the light of treatment device does not aim at the eyes) , Prostatitis, please place the device between the legs and under the lower abdomen. ②: Scapulohumeral periarthritis, put the device on the pathological shoulder, if you have mastitis, put the device on the inflamed part. ③: When using in trauma or wounds, please ensure that the device does not touch the skin and keep a certain distance from the skin. ④: Turn on the light source and gently open the circuit. Adjust the power to the required range and the corresponding temperature that the device can withstand. ⑤: Irradiation time: 10-30 minutes, optional.