A method for security and/or automation systems is described. In one embodiment, the method may include receiving, at a power adapter, power from a power supply, routing a first portion of the power received from the power supply to the doorbell unit, and routing a second portion of the power received from the power supply to both the device of the doorbell unit and the doorbell chime when the doorbell button is being actuated. In some cases, the power adapter is wired, via doorbell wiring, to at least one of a doorbell chime, a doorbell unit, and the power supply. In one example, the first portion of power is routed to power a device of the doorbell unit when a doorbell button of the doorbell unit is not being actuated.