A V-Series 1RU 12 Pushbutton key panel is used to increase the number of  Talk/Listen paths for a user. It has 12 talk pushbuttons and 12 listen pushbuttons. 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 (Pushbutton with Pushbutton). This product is also available as Lever and Rotary extension key-panel types.