Sound Switch Controller - Delay Time Off Relay 12VDC 10A [FA408] This circuit was already assembled to control any electrical system by sound, Use sound from clap sound or any short time loud sound, one pot on board to adjust the sensitivity of input sound. The second one to adjust Delay time to turn off (1-60 Second). MIC is to receive the sound. A sensitivity adjustable switch that can be activated by sound and capable of 1-60 second delay. Power supply : 12V. PCB dimensions : 2.6" X 2.3 See more info via last picture (circuit diagram)