UHF FQ SEL V/OFF/T 5V BL NO GS 071-01546-0202KFS 599A UHF Comm Control Head | 5V, Black, Volume ControlDigital control head for use with KTR-909B and KTR-909A UHF communications transceiver.May be installed alone or in tandem configuration7-segment gas discharge readoutsRemote-mounted switch can be ..