A slider assembly provides a connection between a vehicle body and a vehicle suspension. Each face of the composite can perform independent functions in a single application, thereby optimizing performance. The speaker is accommodated in the display casing for outputting sounds. Each slide block may have flanged ends and an inner cavity for receiving a segment therein. At least a portion of the first image is optically transmitted from the display screen to the display area via an optical coupling system for display in the display area of the housing. The unit includes: a transmitting and receiving circuit connected to the portion ; a transmission control portion performing communication control; an arrival order determining and retransmitting circuit portion connected to the portion and to at least three of transmitting and receiving ports which are capable of connecting to the LAN.