According to the Greenwich Study of Residential Security report, homes without a security system are 2.7 to 3.5 times more likely to be subject to a burglary. A security alarm is a system designed to detect intrusion into a building or other area. Security alarms are used in residential, commercial, industrial, and military properties for protection against burglary or property damage, as well as personal protection against intruders. A security alarm system can be set up using a few tools, namely window and door vibration sensors, motion detectors and glass break detectors which can all be tied in to a siren notifying you of a threat at the speed of sound. Not only does it protect against human intruders, but can also alert you to unseen intruders such as smoke and carbon monoxide. This can also be detected with a sensor which can be connected to the same siren. All of these different detectors and sensors can be set up to send not only alerts to your mobile and email, but even to emergency response authorities. The main and most essential reason to invest in a security system is to deter crime in your home.