One way of protection for your love ones and properties is to install door alarm systems in your home or establishment. Door alarm systems provide additional protection against intruders or unwanted guests. Door alarm systems are basic security alarm systems. The most commonly used devices for door alarm systems are magnetic switches and contact switches.

Most door alarm systems have door chimes; microphone and speaker systems. Some have close circuit surveillance cameras. Door alarm and chimes enables the occupant of the house or building to identify who is on the other side of the door. While the microphone and speaker system enables the person on each side of the door to communicate with one another, the surveillance camera enables the occupant to see the physical appearance of the guest or intruder.