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The hub device 180 is further communicatively coupled to one or more of the smart devices using a radio communication network that is available at least in the smart home environment 100. Communication protocols used by the radio communication network include, but are not limited to, ZigBee, Z Wave, Insteon, EuOcean, Thread, OSIAN, Bluetooth Low Energy and the like. In some implementations, the hub device 180 not only converts the data received from each smart device to meet the data format requirements of the network interface 160 or the networks 162, but also converts information received from the network interface 160 or the networks 162 to meet the data format requirements of the respective communication protocol associated with a targeted smart device. In some implementations, in addition to data format conversion, the hub device 180 further processes the data received from the smart devices or information received from the network interface 160 or the networks 162 preliminary. For example, the hub device 180 can integrate inputs from multiple sensors/connected devices including sensors/devices of the same and/or different types, perform higher level processing on those inputs—e. g. , that of the wire 1016. Connector 1050C and 1050D are respectively coupled to the wires 1018 and 1020, and open wire ends of the connectors 1050C and 1050D are bent into a hook shape such that they may be fastened onto connectors on the doorbell chime 1006 directly. These connectors are compatible with existing wires 1014 and 1016 and the connectors of doorbell chime 1006, and ease the installation of the doorbell camera 106 without requiring the user to use additional tools. Referring to FIG. 10C, in some implementations, the doorbell camera 106 includes a voltage monitoring unit 1022 configured to generate the supply monitoring signal based on the input AC voltage.