Can I set up the Secret Knock feature on a 2nd / 3rd push button with a different melody and Halo Light colour?

Yes, you can do this for as many push buttons as your doorbell can store in its memory. Your push button must first be already linked to your doorbell. Press your push button 3 times in quick succession. The doorbell will now sound the same melody as when you press the push button once. Now press the melody button P3 Chimeon your doorbell one or more times until you hear the melody you want to select for the “Secret Knock”. Where applicable, you can now press the Sun button sun one or more times to select the desired Halo colour for the “Secret Knock”.