Builtin red light, which reaches the inner knee, can purify the impurities in body fluids and blood, make flow faster, and remove joint effusion.
Three level temperature, heat energy penetrates the skin, speeds up blood circulation, clears the meridians, and keeps the knees away from dampness and cold.
Builtin high?frequency vibration motor, all?round vibration to the knee muscles, fully release the pressure.
Builtin infrared sensor lamp, wavelength 615?650NM, wavelength 16 nanometers, irradiate the knee joint, directly to the deep layer of the knee.