This is a square-wave oscillator triforce! Each independent oscillator is controlled by a large frequency knob and played with the corresponding button. In addition to that you can also turn on a three step sequencer that will run through each oscillator letting you build triplets. You have a speed control for the sequencer which can go extremely fast and let you create some very interesting sounds.
You also have a volume control and 1/4″ output. Powered by an 9v battery and all hand built into an old wooden box.