Abstract: A doorbell system includes a power supply circuit, a smart module, a chime, a chime switch and a control module. The smart module provides a smart function. The chime switch is electrically connected between the control module, the smart module, and the power supply circuit. When the chime switch is turned on, the current flows through the chime under control of the control module. When the chime switch is turned off, the current cannot flow through the chime under control of the control module; consequently, the buzzing sound cannot be generated.

Abstract: A power supply method for a video doorbell is provided. The video doorbell is electrically connected with an external power supply unit. The video doorbell includes a camera unit, a power storage unit and an actuation unit. The power supply method includes the following steps. If the actuation unit is triggered, the power storage unit provides electric power to the camera unit. If the actuation unit has been triggered for a time duration longer than a predetermined length of time, the power supply unit provides electric power to the camera unit.

Abstract: A doorbell system includes a power supply circuit, a smart module, a chime, a chime switch and a control module. The smart module provides a smart function. The chime switch is electrically connected between the control module, the smart module, and the power supply circuit. When the chime switch is turned on, the current flows through the chime under control of the control module. When the chime switch is turned off, the current cannot flow through the chime under control of the control module; consequently, the buzzing sound cannot be generated.