Blackmagic Design GPI and Tally Interface, GPI and tally interface for ATEM mixers, Tally signals can be transmitted to cameras, playback devices and monitors via the eight tally outputs equipped with contact closures - this indicates which camera is on air, If more than one tally output is required, multiple GPI and tally interfaces can be linked together., Connection to an ATEM mixer is via Ethernet, Compatible operating systems: Mac Mojave 10.14, Mac Catalina 10.15 or higher / Windows 8.1 and 10, Power supply: 12 V mains adapter with socket adapters suitable for all countries (included in delivery), Dimensions (W x H x D): 90 x 23 x 96 mm, Weight: 120 g@+@+@+*Connections:*@+@+@+, Contact closure: 25-pin D-type connector for 8 opto-isolated inputs and 8 contact closure outputs, Computer interface: 1 USB 2.0 high-speed port for configuration and product software updates, Inputs: Optical isolators triggered by earth, 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