A combination cap and shoe set is provided wherein each of the cap and shoe include illuminated regions. The transponder unit responds to the probe unit’s request by transmitting its own radio frequency modulated signal containing any information requested by the probe device. In another example, the connector incorporates two grooves in the bore of the housing to allow the rotation. A level of the VSSM is based on the operation signal, wherein VSSM is at a lower level when in the read operation than when in the write operation.