An apparatus includes a controller body configured to determine whether a light radiation mode is selected and an operation is started through a users manipulation, the controller body comprising a wireless transmission unit configured to transform an LED driving signal output according to the selected light radiation mode into a radio signal and transmit the radio signal, and a wireless electrode probe configured to wirelessly receive the LED driving signal from the controller body by establishing wireless communication with the wireless transmission unit. The wireless electrode probe is configured to be driven by the LED driving signal received from the controller body to emit the light of a predetermined wavelength range, which increases concentration of a material for relaxing smooth muscles of a human body.
