Access Control System: the combination of a credential, a reader, a controller, a power supply and an electric unlocking mechanism, which combine to allow a system administrator the ability to grant or deny access to a controlled area. In its simplest form an access control system unlocks a door for an authorized user; in advanced configurations, user access can be designated by day and time, system administration is managed via computer, and audit trails are created.

CCTV surveillance systems play an important role in fighting and preventing local and international crime. Besides fighting terrorism, CCTV security systems installed in public places or retail markets can deter crime, provide the police with leads, help citizens feel safer, and improve the economy of a crime-stricken area. Most CCTV systems have now gone digital for improved performance, surveillance camera manoeuvrability, and quicker feedback as compared to analog systems. DVRs are capable of saving CCTV data to a PC for up to ten weeks of recording and some even feature motion detection technology, which means that the footage is only recorded when motion triggers the DVR system.

An automatic fire alarm system is designed to detect the unwanted presence of fire by monitoring environmental changes associated with combustion. In general, a fire alarm system is either classified as automatic, manually activated, or both. Automatic fire alarm systems can be used to notify people to evacuate in the event of a fire or other emergency, to summon emergency forces aid, and to prepare the structure and associated systems to control the spread of fire and smoke.

Home security is an issue which must be of a significant concern to everyone. Whether a person buys a cheap home security system or an expensive one he or she should see to that they are able to install as many security features as possible because they are now so affordable, it has become common to purchase.

The burglar alarms are useful in catching the burglars red handed at the moment of burglary. The moment the burglar breaks into the place, the alarm sounds and everyone will be alerted.

Now-a-days are wireless security systems are often used, due to the some setbacks found in the wired security systems. The burglar has a chance to break the circuit wire in the wired security system, so that the alarm maynt work. As radio signals are used in wireless security systems, any intervention caused by the burglar is absorbed by the sensor, which in turn sends a radio signal to the alarm, and the alarm sounds to alert everyone.

The security systems consist of control panel, sensors like motion based passive infra red sensors, door magnetic contact, smoke & gas leak detectors, telephone dialers with recorded message & hooters/sounders.