New door bell

I need clarification from someone about using “talk” green button when you talk to someone on the other end. Once you push it it turns from green to white mute button. do i have to hold it to talk between two parties or once is press you just talk and don’t have to do anything else?

I’ve had the doorbell for several months. You press the green talk button once to talk. You do not need to hold. To mute the doorbell so the person cannot hear you speak, press the white mute button.

Yep, that is a toggle button. Press to speak, press again to mute.