circuit bent creation silver lizard sandwich OPTICAL theremin analog synthesizer plays usingLIGHT  1/4 output phone jack works with regular electric guitar cables, guitar amp and battery not included ,but required please scope the videos to see how TRIPPED OUT  these sound a delay pedal is being used the video creating a repeating or echo sound  if the video link does not appear on your phone please go to you tube and search for "dragons eye optical theremin"