An electronic device for 3-dimensionally inputting a user command and a method employing the same are provided. The receiving side receives the NF symbol signal, and automatically controls a frequency by estimating a frequency deviation from the incoming signal. The auto flicker band detection process includes performing a motion mitigating process on an illumination intensity indication. The pumping device also includes another slide switch, whereby when both slide switches are properly set, the internal pressure of the container is increased or decreased due to the supply of pressurized air from an external source and oil can be sucked into and drained out of the container accordingly.