[GreenKeys] A battery-powered teletype

[Sean Kelly]

OK, sorry for the obfuscation, it's TTY or RTT on a cell phone:

https://youtu.be/G4m9-sk7K-s?t=127

https://www.youtube.com/watch?v=pvQGltJ3030

Seems the Deaf have been migrating away from TTY at home since 2017 - replaced with this instead thanks to the FCC, or using their computers, etc.

Sean
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