In our days, there is a necessity of door alarms, because of rising criminality rate. Some people or companies use surveillance cameras, but this requires a big investment of money, time and effort. Driveway alarms are much cheaper, and you don’t have to make time to watch the surveillance tape or stare at a screen whenever you want to assure yourself that no thief is perpetrating your property. However, you can use a really inexpensive trick called fake security camera. You just find a metal box that looks like a normal surveillance camera and install it at your door. It doesn’t cost anything, neither time nor money, but it can serve as a kind of scarecrow for potential burglars.
There are different sorts of door alarms to choose from, wired alarms, wireless alarms, infrared drive way and metal detection alarms. Each one of these has its advantages and special features. Wired alarms are quite inexpensive, but they are complicated to install because of all the wires and knots. That is why; more common during these days are wireless door alarms. They are simple to set up in every part of your home, from your children’s room to the roll up garage doors. These alarms work with magnet bands. When the connection between the two magnets breaks off, the transmitter sends a message to the receiver which activates the alert noise. For alarms more sophisticated, when the receiver is a mobile phone or an iphone, the message is similar to a radio wave. This helps you have control over your house even if you are at work or in a vacation. Infrared alarms are based on infrared sensors which set the noise on whenever a move is detected by the sensors.
And finally, metal detection alarms are based also on magnet properties to attract metals, but they are utilized more in places like airports or government offices, places where a high level of security is demanded.