Custom made Ring Modulator with internal Oscillator controlled by a Photocell. The green lens on the bottom of the box contains a photocell that will control frequencies using light and shadow, much like the Theremin "Photon Box". Use any electronic instrument or microphone. It has one 1/4' input and one 1/4' output. It has an LED power indicator, on/off switch. It can be easily fitted with a true bypass switch. One manual frequency control knob and one volume knob. Operates on one 9volt battery or ac power adapter (wall wart).