The Teletouch pushbutton automatic transmission selector was an extremely complex feature. Either a spring-return switch position or a pushbutton arms single sweeps. New rectangular digital ETR stereo system options were introduced and replaced the dial pushbutton stereos. Traditionally, the EF4 line is attached to the INPUT momentary pushbutton on the COSMAC Elf. Fire-safety equipment includes infrared sensors, fire extinguishers, foam sprayers, and pushbutton alarms. Other options included a heater-demister unit, as well as a "Moparmatic" deluxe pushbutton transistor radio. The user manually arms the sweep circuit (typically by a pushbutton or equivalent). Many locomotives manufactured during the 1990s made use of pushbutton controls. A manual pushbutton was pressed as each house boundary was passed. Optional was pushbutton 4WD with low-range transfer case. Locomotives of European origin have featured pushbutton control of air horns since the mid-1960s. The SL model, pushbutton start and Sandstone interior color are discontinued. In 2012, Tunnell founded Spotkin along with former partners of PushButton Labs, GarageGames, and Dynamix. This service was built by Pushbutton for Microsoft Mediaroom.