This is the cordless knee wrap that uses electrostimulation to provide drug-free pain relief. It employs transcutaneous electrical nerve stimulation (TENS), an approach widely embraced by physical therapists and other medical professionals, to deliver harmless electrical pulses to block pain signals from reaching the brain. Ideal for helping temporarily relieve knee pain caused by sprains, surgery, or arthritis. It secures with hook-and-loop fasteners and has a low profile design for under clothing comfort. Charges via USB. Fits knees up to 18" circumference. Includes three patella and three rectangular TENS pads that provide 90 days of treatment.