Hello David, you are correct. That's what I meant. Plus, as you said, you would need the 24V to go from the power supply to the relays of UniPi and to the button so you could switch the Teleruptors (which switch on the light) by the UniPi and by the button. Simple wiring diagram: 24V -> Button -> UniPi Digital Input + Teleruptor –> so the light switches every time you press the button plus UniPi knows that you switched it manually 24V -> UniPi Relay -> Teleruptors [attachment=0:1btsrd7c]20150209_120857_.jpg[/attachment:1btsrd7c] But you would have to deal with the digital input event after you turn on the relay on UniPi. Hope it helps. Best regards, Tomas