The K2655 Electronic Watchdog Alarm SELF-ASSEMBLY kit is a sound activated circuit that produces a natural sounding barking dog with a sensitive "ear" to everything that comes near it.
The "ear" is a small electret microphone with adjustable sensitivity.
The board has a secondary trigger input for use with a photo-electric cell, motion detector, smoke detector, etc.. (not included). This input requires a volt-free contact closure (relay, push-button, etc.).
It is a faithful guard dog that never sleeps or needs to be taken for a walk.Specifications