The control hub is the smart control center that connects other smart devices (sold separately). The control hub alone includes 16 million color-turntable LED night lights and a convenient alarm clock with customizable ringtones. The hub is plugged into a socket and acts as a receiver for sensors (sold separately). It connects directly to the router via Wi-Fi. The group of sensors (sold separately) connects to the control hub through Zigbee. Having a set of sensors (sold separately) enables an additional level of automation in your house as you can set the rules of when your devices will work, not work, when functions are activated, and more, all based on sensor readings. For example, you can turn lights on when you pass a sensor or set your purifier to start up when you close a door, etc. the possibilities are endless.