A V-Series 1RU 12 Lever Extension key panel is used to increase the number of Talk/Listen paths for a user. It has 12 Talk/Listen lever keys and each key has associated up/down audio level control buttons. It connects to the host panel over CAT5 up to 7m (25'). Up to 8 Extension panels can be connected to the host panel. Extension panel keys should match the host panel (lever with lever).