The present invention relates to a tire comprising a means for indicating the position of a tire among the set of tires of a vehicle. During normal operation, the active cluster member may operate the routing protocol and communicate with the neighboring components using the cluster’s address. The drain structure panels have a laterally extensive backing grid and a plurality of spaced apart tubular support members projecting therefrom. And a backlight unit is fabricated beneath the display module and has a lightguide, a lamp disposed aside the lightguide to emit lights into the lightguide in the edgelight form, and a plurality of optical films disposed on the lightguide for scattering the lights emitted from the lightguide uniformly. The spacing members have substantially co-planar surfaces configured to mate with a surface of a first optical structure.