The present invention relates to input devices and particularly to input devices for use with computer and telecommunications systems andor other object systems andor devices. Then, a surface cleaning process is performed. The switch transmits a given command symbol to the wireless terminal, and the wireless terminal decodes the symbol and executes the corresponding commands specified by the symbol. Several advantages of the present invention are easy to be manufactured, having less weight, producing low eddy current, incurring lower cost and having better quality control.