Techcam Solution located in Chennai, India is a direct supplier of security cameras (CCTV, Bio-Matrix, Dvr, Fire-Alarm, and network IP), video surveillance systems, and CCTV equipment (Closed Circuit Television) for home, business and government. A digital video recorder (DVR) is an electronic device that records video in a digital format to a disk drive, USB flash drive, SD memory card, SSD or other local or networked mass storage device. Biomatrix systems theory claims to be an integrated systems theory. It was developed through an interdisciplinary PhD programme at the University of Cape Town.A fire alarm system is number of devices working together to detect and warn people through visual and audio appliances when smoke, fire, carbon monoxide or other emergencies are present.networking is the construction, design, and use of a network, including the physical (cabling, hub, bridge, switch, router, and so forth)related to the network.