Abstract: A device for controlling a power level received by a feature of a mobile terminal includes a control unit for setting the power level to a first power level as a function of time. The control unit may also be configured to set the power level to a second power level as a function of time. The control unit may accept one or more user-defined values, such as a user-defined value for the first power level and user-defined values for a first predetermined time and a second predetermined time. The function of time may be a function of the first predetermined time and the second predetermined time. The mobile terminal may be an electronic device that is optionally battery-powered and may include a cell phone. The feature whose power lever is controlled by the device may include a light of a backlit viewing screen.