Blackmagic Design ATEM Talkback Converter 4K; 4K signal converter / extender; Provides up to 8 cameras with SDI talkback using embedded audio channels 15 and 16 used on Blackmagic Studio Cameras and ATEM Camera Converters; Supports 12G-SDI for all SD, HD and Ultra HD formats up to 2160p/60 and provides BNC