A bicycle shock absorber for differentiating between rider-induced forces and terrain-induced forces includes a first fluid chamber having fluid contained therein, a piston for compressing the fluid within the fluid chamber, a second fluid chamber coupled to the first fluid chamber by a fluid communication hose, and an inertial valve disposed within the second fluid chamber. In one embodiment, at least on of the memory card interfaces is configured to interface with a plurality of different memory card types. To achieve required modulation bandwidth in wide-band applications such as WDCMA, an analog amplifier is used to provide the envelope signal. The coupling portion includes a coupling main body fixed to a surface of the second housing facing the first housing, a guide pin protruding from the coupling main body so as to be able to advance and retreat within the guide groove and including a tip portion, the tip portion being housed in the guide groove, and an urging member urging the guide pin toward the bottom portion of the guide groove. This invention applies among others to players to which a recording medium that stores contents is removable. The space inside the lavatory is expanded, allowing the use of a bench 150 etc.