medical alerts systems for seniors
, by blocking the field of view of the lens assembly 704. The button top 706 is part of the button assembly, and is configured to receive the user press on the button assembly. The front cover plate 708 therefore includes a button opening 710 configured to expose the button top 706 of the button assembly on the front cover plate 708. The button top 706 has a first diameter that is substantially smaller than a second diameter of the opening 710 of the front cover plate 708. The button top 706 can move vertically in a direction perpendicular to a plane of the button opening 710 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.