Notes : Each led diode inside with three chips at 1 pc 660nm and 2 pcs 850nm . Near Infrared 850nm is invisible to the human naked eyes . 660nm of red light This light can be seen by the human eyes and targets skin cells. 850nm of near infrared light This light cannot be seen by the human eyes and targets deep tissue. Specifications Rating Power : 60W LED QTY : 120*0.5W Net Weight : 0.58 KG Timer : 20 Minutes Product Size : 400*200*4.95MM Irradiance : 0 Inch > 100 mW/c ㎡ Lifespan : Over 50,000 Hours User Instructions : 1). Plug into the AC socket and all led diode on . Or use a right power bank to power the device . Power bank output suggest equal or over 5V 2A . 2). Distance : 0 inch for best results , place to anywhere you suffer the joints pain . 3). Usage Frequency : Use device daily 1-2 times and last for at least 4 weeks , and each time suggest 20 minutes on one treatment area . Than move device to next treatment area . 4). Unplug device and store in cool dry area . 5). Maintenance : Continue using several times a week . Here show you some examples how to use the red light device . You and your petscan enjoy the red light at different ways for like shoulder , back , feet knee ect . Even though this technology don’t have side effects , we suggest taking thefollowing precautions : This device is not waterproof !Not intended for the use by children and pregnant woman.Do not exceed 30 Min. on one same treatment. Red & Infrared Light Therapy Belt Blue Infrared Light Therapy Belt Black Infrared Light Therapy Belt 660/850nm Large Size Red Light Therapy Pad Add to Cart Add to Cart Buying Options Buying Options Customer Reviews 3.8 out of 5 stars 28 4.0 out of 5 stars 155 4.1 out of 5 stars 83 4.3 out of 5 stars 23 Price $137.97$137.97 $93.23$93.23 — no data — no data 660nm ✓ ✓ ✓ ✓ 850nm ✓ ✓ ✓ ✓