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When people complain about the iPhone, one of the loudest complaints is the phone's lack of a physical keypad. For many, no physical keys is a deal-breaker, driving consumers to a BlackBerry or Android phone instead.

Car door keypads have traditionally comprised of micro-switches that directly carry the motor currents used to operate windows and mirrors. In the case of electrically operated folding mirrors, a single multiple contact switch unit controls six motors in both directions.