Options such as navigation and burglar alarm were also offered. He gets knocked out, but manages to press the burglar alarm. Examples are door and window sensors in burglar alarm systems and tamperproofing methods. The family also installed new plumbing and heating and a burglar alarm. Narcy betrays him, triggering the burglar alarm while he is inside. He died November 2, 1911 in his laboratory while working on a wireless burglar alarm. The main building also possessed a burglar alarm from 1932. He experimented with an electrical burglar alarm and other electrical devices at his home. Edward agrees, but when he picks the lock, a burglar alarm is triggered. The husband accidentally turns on the burglar alarm and the real criminals are apprehended. Upon returning home, Dykstra locks his doors and activates his burglar alarm system. The burglar alarm goes off, but the police decide not to attend. But the burglar alarm rings and they all get caught. One day, she presses the burglar alarm button by mistake at Delphine's fashion store.