To manufacture burglarproof equipment that sounds a buzzer when a body covering the lock (hole) of a door (knob) is pulled up by providing within the body a contact code switch, for controlling a relay and the buzzer, and a lid for covering the switch and batteries or the like.

Assuming that a lock (hole) contact switch is forcibly pulled up while it is off, contacts (switches) for use inside a body are provided on the body sides and leg sides of two legs, and an electric circuit is assembled in parallel with the lock (hole) contact switch so that a warning sound is issued in the case of normal removal unless two leg bottoms serving as bases fastened in place by double-sided tape and screws are removed. A portion around a body hole for issuing the buzzer sound, once started to sound, will not stop sounding unless a code switch is adjusted or the circuit is broken.