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, Ethernet, HomePlug, etc. , or any other suitable communication protocol, including communication protocols not yet developed as of the filing date of this document. In some implementations, the smart devices serve as wireless or wired repeaters. In some implementations, a first one of the smart devices communicates with a second one of the smart devices via a wireless router. The smart devices may further communicate with each other via a connection e. g. , a Bluetooth communication link. Optionally, the camera module 1004 is configured to in accordance with a determination that the input AC voltage is not greater than the supply threshold, activate a low power mode. In the low power mode, the images are optionally captured and/or transmitted to the server at a lower resolution and a lower frame rate, and local image processing may be disabled to conserver power. In some implementations, the doorbell camera 106 alternates between a first camera mode and a second doorbell mode during its normal operation. The bypass unit 1012 is configured to operate in the first camera mode when it is determined that no user press has been applied to the button.