Blackmagic Design GPI and Tally Interface; GPI and Tally Interface for Atem production switcher; With 8 Contact closure tally outputs, tally signals can be send to your cameras, replay machines and monitors, so everyone knows which camera is 'on-air'; if more tally outputs are required, several GPI and Tally interfaces can be linked together, because it connects via Ethernet to an ATEM production switcher; Connections:; Contact Closure: 25-pin D-Type connector provides 8 opto-isolated inputs and 8 relay Contact closure outputs; Computer interface: 1 USB 2.0 high-speed connection for configuration and product software updates; Inputs: Optical isolators triggered by grounding, max. 5 V at 14 m; Outputs: Mechanical relay Contact closure by earthing, max. 30 V at 1 A; Ethernet: 10/100 BaseT with loop through; Compatible operating systems: Mac Mojave 10.14, Mac Catalina 10.15 or higher / Windows 8.1 and 10; Power supply: 12 V power supply unit with socket adapters suitable for all countries included; Dimensions: (WxHxD): 90 x 23 x 96 mm; Weight: 120 g