This 2-in-1 transmitter & receiver now means you can 'screen' your visitors before you open the door. They just press the button as a doorbell & you can have a 2 way conversation with them from the safety of your own home. You can also use it as an intercom system...have one indoors and the other outside, or in another room. No wiring required.
Wireless range up to 50 metre in open area.