The TLC-4LS is designed to work with four input Livestream Studio switchers. It connects via USB to your switcher and to either the TL-2-C tally lights or RU-2 Relay units via Ethernet style cables up to 1000' long. The TLC-4LS supports both program and preview tally. Use the XLR intercom pass through port to inject your intercom signals into the tally cable and then connect your remote beltpacks to the tally light's 1/8" port with (proper adapters) and save a cable run.