Embodiments are described herein that involve a computing device initiating playback of a particular media item on a media playback system that is registered to a particular account of a social media service. The system and method include forming a cooperative relationship between a medical doctor and at least one alternative health care provider. A reference signal is generated such that it starts to discharge at the same time from the same precharge level towards a reference level which falls between the two discharge levels corresponding to single and double match condition. When a key press of at least the predetermined time is received by the operating unit, the control unit searches the storage unit for names that include a character assigned to the pressed numeric key, and displays the found names on a display unit. In another aspect, a drive member includes a pawl portion and a biasing portion.