***** **********Best Quality Guranteed. *****Doorbell notifications - Get calls on your smartphone or tablet when someone presses your Doorbell*****Remote communication - Talk with visitors from your smartphone or tablet*****Visitor messaging - Visitors can leave a message for you to listen remotely at your convenience*****Add-on to your existing Audio Doorbell - Simply plug-in the Chime and add to your account*****Instant Doorbell press alerts - Receive instant chime alerts when someone presses your Audio Doorbell*****Instant motion & sound alerts*******Requires existing Base Station*****Requires existing Base Station to use an Audio Doorbell or Chime