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Entry level systems usually include some door and window sensors, a motion detector, and a hub that communicates with these devices using one or more wireless protocols such as Wi Fi, Z Wave, Zigbee, or a proprietary mesh network. You can add extra door, motion, and window sensors to provide coverage for your entire
house and build a comprehensive system that includes door locks, garage door openers, indoor and outdoor surveillance cameras, lights, sirens, smoke/CO detectors, water sensors, and more. A word about wireless protocols: In a perfect world, all home security components would use the same wireless standard to communicate with the main hub, but factors such as power requirements, signal range, price, and size make it virtually impossible to settle on just one. For example, smaller components such as door/window sensors typically use Z Wave or Zigbee technology because they don't require a lot of power and can be powered by smaller batteries. They also operate in a mesh topology and can help extend the range of networked devices. However, neither protocol provides the bandwidth that you get with Wi Fi,
which is why it is usually used in security cameras to provide smooth video streaming, and in other devices that require a fat pipe.
Despite it being against international law and the law of the U. S. to torture anyone for any purpose Restatement of the Law Third, the CIA was known to have used torture to obtain information and confessions from a number of individuals after 9/11. Furthermore, of 119 people held in custody and tortured by the C. I. A.