The Blackmagic Design GPI & Tally Interface for ATEM Production Switchers is designed to display tallies to indicate the on-air status of video signals. It features 8 contact closure inputs and 8 contact closure outputs for connecting to ATEM switchers and Videohub routers for operation. Additionally, it can be used with multiple interfaces to increase the number of inputs and outputs. you can send a tally signal to your cameras, replay machines and monitors so everyone knows which camera is ‘on-air’! If you need more tally outputs, simply connect multiple GPI and Tally Interfaces together because it connects via Ethernet to your ATEM production switcher. This unit is designed to display tallies to indicate the on-air status of video signals. Additionally, the GPI & Tally Interface can be used with multiple interfaces to increase the number of inputs and outputs.