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5. Domestic cameras which are positioned inside the homes but facing towards the periphery to keep a watch on home intruders and thieves. There are also few nest cameras which can be kept within the home or store to monitor activities of workers or nannies. In the market we can find many more such cameras which are specific to purpose. Door and window sensors are also another key invention in home safety and security. These work on the basic principle of infrared, that is when a door or a window is opened and the infrared sensor is cut without prior intimation to the system, the security alarm goes off and alerts the concerned party of an abnormality in situation.home security houston
The Roost RSA 400 takes things further and, besides delivering every function of the Roost Smart Battery, it detects the usual trio: smoke, CO and fire and, additionally, it can also sense the presence of natural gas a unique addition for this type of detector. Even if the Roost RSA 400 could fit among the smart detectors, when compared with Halo Smoke Alarm, Onelink or Nest Protect, its design is pretty unremarkable. So, similarly to the traditional smoke detectors, the case of the Roost RSA 400 is circular, while towards the bottom, the body gets narrower and finishes into a larger, thin plate where the device gets in contact with the ceiling or wall. Since the plastic case is covered by a white matte finish, it will easily blend in on a ceiling it actually looks like a flush mount lighting and, since it is a relatively small device it measures 5. 63 x 5. 63 x 1.