Suggested by Doctors/Vets, most popular one in Market. Big battery capacity 5200mAH. Most popular one suggested by doctors/vets. Newest Portable Handheld Pain Relief Cold Light Therapy Device for HUMAN/ VETS. We suggest to use it 25mins/time. Around 15–20mins for dark skins. Pain Relief for Knee. Back Joint and Muscle Pain. Safe healing Cold light wavelengths. The 808nm is effective for healing pains. This high quality device is safe and portable when you at home or travel. It is effective at treating both Human and Animals of all areas. You could choose the time. The battery capacity is longer than normal ones. 5200mAh for over 10 days after one time re-charge. Three CENTRAL 808nm LASER DIODES are invisible by eyes. PHYSIOTHERAPY PAIN RELIEF DEVICE HOME USE: Suitable for human wrist, foot, elbow, ankle, neck, waist, back, ear, face, shoulder, back, leg, knee, nerves, muscle pain, tennis elbow. Also it serves as an aid to therapy for various diseases such as frozen shoulder, arthritis and neuromuscular pain. Treatment time is one or twice a day, about 20-30 minutes each time. 15 days is one treatment course and 2-3 days’ interval between 2 courses. 30days no reason return. 1x Safety Glasses with zipper case. This device has a perfect combination of 12x 650nm lasers and 3x 808nm laser. The 808nm lasers are more powerful but invisible to the human eye. Power: 650nm5mW each 808nm150mW each Total=510mW. 3 levels of intensity: Level 1 power is 170mW Level 2 power is 340mW Level 3 power is 510mw. Battery: Rechargeable lithium battery with 5200mA capacity. Lens Material: Tempered glass. Long Press center”on/off” button to turn on. (red light not light). Choose treatment time, power level. Short press “on/off” button to start working. Red laser light coming, and noted that the three. 808nm in the center are invisible by eyes. Short press “on/off” button if you want to stop it. Long press “on/off” button to Turn it off. 1st week: Start with the secondary power on pulse mode 2nd week: Adjust to maximum power on pulse mode 3rd week: You can start using it on maximum power on constant mode.