A planar photoluminescent lamp includes a plurality of glass spacer beads affixed to a first glass plate, and a second glass plate in contact with the glass spacer beads. The apparatus of the present invention includes a retractable wheel system to facilitate apparatus mobility. When the PTT button of any one of the terminals is not pressed, the PTT communication server assigns a token to the management server which is equipped with no PTT button, and distributes advertisements or contents selected by the management server to which the token is assigned to the terminals.