ATEM Television Studio features built in talkback that takes advantage of rarely used SDI channels 15 and 16 to send talkback audio to and from the camera. There's also headset connections on the front panel for talking to and listening from cameras that support SDI talkback. The talkback from the camera is embedded in the SDI video feed from the camera to the switcher. If you connect the talkback SDI outputs of the switcher back to the camera, then the director’s talkback audio is sent to the cameras along with tally and camera control. The 4 SDI outputs feature talkback to cameras with mix minus. This lets you send program audio back to an interviewee so they hear everything except themselves, and won’t be distracted by hearing a delayed audio echo.