4-Channel Headset/Speaker Main Station with Built-in 2-amp Power Supply, Rack Mount (2RU) Four intercom channels with programmable front-panel buttons. High-capacity, fail-safe power supply supports up to 40 RS-701 beltpacks or 10 speaker stations or 12 headset stations; 3 IFB channels, announce button/relay, channel-linking button and Remote Mic Kill switch. Other features include: - All Channel linking - Program input with individual channel level controls - Remote Mic Kill switch - Stage Announce