These were built in a limited run of three. They are played by bridging the connection between the two metal contacts. The more contact made the higher the pitch. You can experiment with friends by making a human chain of resistance.
Built in is a modulation effect. There is only one control and it adjusts the speed of an LFO modulator. The range can produce everything from very long on/off pulses to quick robotic beeps to very fast throaty moans.
You have a toggle power switch and an LED light that flashes in sync with the LFO. It is powered by an external 9volt battery and there is 1/4″ output.