Made of thermoplastic or metallic materials, these pushwheel switches are operated by a rotating wheel or dual buttons and are activated by a rotating shaft with several stop positions. Changing the position of the rotating shaft generates a circuit code in binary, octal, or hexadecimal format. Pushwheel switches are available in standard, miniature and subminiature sizes and are sometimes mounted on printed circuit boards (PCBs) in order to control the behavior of electronic devices. Pushwheel switches offer a variety of special features and can be used in numerous applications. Some devices have imprinted indicators such as ON/OFF or HI/LOW. Others include audible indicators for position intervals and self-cleaning features to reduce mechanical wear. Many pushwheel switches are listed with Underwriters Laboratories (UL), certified by the Canadian Standards Association (CSA), or feature the European Union’s CE Mark.