The Sprained Knee Polyarthritis Laser Therapy Machine has two probes: Probe A like a pen and Probe B like a shower. Probe A has one 808nm laser diode with max. 180mW; Probe B consists of four 808nm laser diodes and eleven 650nm laser diodes with total max. 775mW. When the two probes irradiate any parts of human bodies and animals, the laser light can be absorbed by living tissues and then produce a variety of chemical substances in cells. These chemical substances cause a series of physiological and biochemical changes but without irreversible damages, such as anti-inflammation, pain relief, tissue repair, wound healing and body function recovery. 

Some acupuncture practitioners have suggested that low level laser therapy could be used much like acupuncture and acupressure, with the laser beams targeting specific points on the body, since the stimulation of pressure points can be used to treat a number of conditions treatable with acupuncture.