Put this page on the TV. Everyone else opens it on a phone, types the short code, and gets their own bell. When the carol starts, tap when your bell glows.
Join on a phone at
Room code
— — — —
Point the camera at the code, or type the four letters.
Waiting for at least 2 phones…
Choir
Waiting to start…
Phones need one tap so the bells can make a sound.