Venue Conference
The picture is you, as the room will see you. The bar under it moves when your microphone hears you.
On the picture: the microphone and camera buttons choose how you go in — red is off. The slider is the room's volume: how loud everyone else is. It stays in the controls once you are in, and all three are remembered on this device.
Enter with microphone off / camera off are the same choices, as boxes. You can turn either on once you are in.
Room is the room's name: lowercase letters, digits and hyphens. Anyone who enters the same name joins you. Your name is what the others see.
Inside: whoever you are meeting fills the middle and you are the small window at the right — tap it to sit in the grid instead. M turns the microphone on or off, V the camera. Share screen shows your screen to everyone.
No seat limit. Nothing is recorded; the audio and video go through this site's own server, not a third party.
Check your camera and microphone here before you go in — everyone sees you the moment you join.