Optionally, the message may include a visual message displayed on the bypass unit 1012 by an LED indicator 1012B according to one of a set of predetermined visual patterns. In some implementations, the message presented to the user may include a ring of the remote chime 1006. By these means, voltage compatibility of the doorbell camera 106 may be determined and known to the user of the doorbell camera 106 before the doorbell camera 106 is installed, thereby avoiding installation of the doorbell camera 106 when it is not even compatible with the supply voltage provided by the transformer 1010. More details on the method 1500 implemented by the bypass unit 1012 are explained above with reference to FIG. 10D. FIGS. 11J and 11K are a front side and a rear side of a sensor board 1108 in accordance with some implementations. The doorbell camera 106 includes a device housing 702 that encloses a plurality of electronic and optical components. The device housing 702 further includes a front cover plate 708 having an button opening 710. A waterproof button assembly 1102 is formed in the button opening 710 on the front cover plate 708 of the device housing 702, and a button top 706 of the button assembly 1102 is exposed from the button opening 710. The front cover plate 708 of the device housing 702 may be made of a single piece of material e.