Aiphone Handset-to-Handset Intercom Kit Includes AT-206 and AT-306 (White)

this is our single door access system it's very simple user comes to the door presses that alerts you on the inside and then if you want to talk to them you press that and right now you're able to listen to what the user is saying and if i want to talk to the outside user i'm the only one that has to press a button i do that by pressing this button and now my microphone is live i released to listen to the outdoor one and you can leave this in this position where you're constantly monitoring the outside station so if you need to listen to a area around the door you can always listen in any time you want and if you don't want to do that hit the off button and then it will be back where you have to press the call button whereas if i'm in talk mode it just kind of makes a clicking noise so but you'd already know they're there since uh you're already listening to it and then there is a door