A circuit that produces a natural sounding barking dog with a sensitive "ear" to everything that comes near it. It is a faithful watchdog; which never sleeps and never has to be taken out for a walk. Specifications: power supply: 2 x 8V AC or 9 - 12V DC / 500mA; choice of two different "dog sounds"; reacts to surrounding noise with adjustable sensitivity; speaker output: 2W at 4ohm; PCB dimensions: 5.6" x 3.0".