Can I add a tally light to my camera for streaming?

Episode 1692 (2:03:19)

Don from Dana Point, CA
Tally Lights

Don wants to create an archive PST file with folders in Outlook. Leo says you can do that by going to export and selecting the folder and add to the PST file. 

How can he let a speaker know he's recording him while streaming multiple cameras for the church? Leo says those are called Tally lights, and if they aren't built-in, Leo recommends using the ATEM mini, which will activate the Blackmagic Camera's tally lights when switching. But for aftermarket lights, there is CUEBI and Tally-Lights.com