CCTV (closed-circuit television) is a TV system in which signals are not publicly distributed but are monitored, primarily for surveillance and security purposes. CCTV relies on strategic placement of cameras, and observation of the camera's input on monitors somewhere. Because the cameras communicate with monitors and/or video recorders across private coaxial cable runs or wireless communication links, they gain the designation "closed-circuit" to indicate that access to their content is limited by design only to those able to see it.
  CCTV is finding increasing use in law-enforcement, for everything from traffic observation (and automated ticketing) to observation of high-crime areas or neighborhoods. Such use of CCTV technology has fueled privacy concerns in many parts of the world, particularly in those areas in the UK and Europe where it has become a routine part of police procedure.
  A fire alarm is a sounder. The sounders make a siren or a similar noise to let people know that there is a fire. Some companies that make fire alarms are Wheelock and Simplex. Sometimes, old-fashioned fire alarms are metal bells.
  An alarm sounder is a device that will make a loud noise when the fire is discovered and the fire system set off with either a manual or an automatic system. The loud sound created will alert anyone at the building or site that there is a fire so they can escape safely. Many fire alarm systems also have flashing lights. These are important for deaf people who cannot hear the fire alarm.
  Many sensitive or important places need to be supervised in order to control access, entry or usage of particular resources or places. Many different access control systems have been devised over time. These devices are installed to ensure precise security of resources or places. The scanners or sensors are used in these devices. A wide range of these devices is devised for home applications to commercial security systems. Triangular Automation has established a great reputation in installation, maintenance of cutting edge security systems.
Today,different types of access control systems are available for different applications-