Smart security systems are highly customizable and available as DIY kits or as full-blown setups that include professional installation and monitoring. A smart home security system connects to your Wi-Fi network so you can monitor and control your security devices using your smartphone and an app. 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.