With its compact size and immense utility, the GPI and Tally Interface SWTALGPI8 is a perfect choice for any production house. It features eight contact closure tally outputs, which enable you to send a tally signal to your cameras, monitors, and replay machines, so that everyone can make out which camera is 'on-air'. Whenever you need more tally outputs, all you have to do is simply connect multiple GPI and Tally Interfaces together. This device connects via Ethernet to an ATEM production switcher.