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The remote chime 1006 is configured to ring 1054 in response to a user press on the doorbell button 1002. A supply monitoring signal is generated 1056 by the doorbell camera 106 based on the input AC voltage to indicate whether the input AC voltage is greater than a supply threshold. Based on a value of the supply monitoring signal, a user is notified by the doorbell camera 106 as to whether there is sufficient voltage to power the doorbell. In accordance with the supply monitoring signal, a message is presented by the doorbell camera 106 to a user of the doorbell camera 106 to indicate whether the input AC voltage is low with respect to the supply threshold. In some implementations, the message may include a visual message displayed by the LED indicator e. g.residential security company
1 Market Estimates and Forecast by Type, 2018–202312. 2. 8. 2 Market Estimates and Forecast by Service, 2018–202312. 2. 8.