A refrigerant system is provided that includes a compressor, a motor for driving the compressor, a refrigerant system component, and a controller. The speaker module is mounted in a casing of a hand-held electronic device. The electronic system and method include a dimmer, a switching power converter, and a controller to control the switching power converter and controls a dimmer current. The process is repeated until the proportion of the scanned data is equal to or more than the threshold value.