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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.

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The Skybell HD has a small backup battery but relies most heavily on being hardwired into your existing doorbell’s electrical. This wireless video doorbell is motion activated, which means that you will receive alerts to your smart phone when anything is close enough to the doorbell even if it doesn’t actually ring the doorbell, which is a nice security addition. Its weatherproof design is particularly thoughtful, with operating capacity in extreme temperatures 40F to 149F, a specialized rust prevention coating on the camera, and a plastic exterior to resist water and help with the connection to wi fi. With a choice of bronze or silver finishes, you can coordinate the Skybell HD with your existing home hardware. Skybell HD connects with several smart home devices such as Alexa, Nest, Honeywell, and others. Get it from Amazon: Skybell HD Video Doorbell.