"Here's the perfect kit to keep someone from messing with your things! If they pick up this kit and turn it over it will produce a loud tone which won't stop even when they put it back down (you need to disconnect the battery to shut it off). Can be propped up next to a door so that when the door opens the alarm falls over and sounds. Features gravity switch, SCR and IC circuitry driving a small speaker. Operates on a 9V battery (not included). Size of board: 2.5"" x 2.75"". Complete with all parts, PC board and instructions. Skill Level 1. C6378 Manufactured by Chaney Electronics "