Meta debuts a prototype wristband to read electrical signals from forearm muscles, letting users control devices without touch, trained on 10K peoples’ EMG data (Cade Metz/New York Times)

Cade Metz / New York Times:
Meta debuts a prototype wristband to read electrical signals from forearm muscles, letting users control devices without touch, trained on 10K peoples' EMG data  —  When you write your name in the air, you can see the letters appear on your smartphone.  —  The prototype looks like a giant rectangular wristwatch.