Looking for an alarm system to make you feel more secure? We've tested all the best professional and DIY home security systems ... before hitting the freelance circuit as a contributing editor.

A microphone on the outside of the door and a speaker inside allowed an occupant to interrogate a visitor, while an alarm could alert police via radio. Closed-circuit television, invented during ...

The goal of museum security is not to close its doors but to make sure they are opened to visitors in a responsible manner." Security systems must start from the roof "Alarm systems must be attached ...

Burglar alarm systems are an essential part of a home security system ... Burglar alarms have a circuit that is activated by ...

The ESP32 checks the switch status every few minutes, and if the door remains open for two consecutive checks, it raises the alarm. A notification is sent to [Guy] via WiFi so that he can rectify ...