Hi Ducttape,

I also have a MSC400 I brought in eBay. I will use that.

The main challenge for me is to understand how the wiring has to be done from the doorbell to the sensor so that the sensor triggers.

Any easy diagram or wiring suggestion? Something like, I need to buy a pair of copper wires and connect the wires from voltage sensor to the specific wires in doorbell etc. any guidance to achieve that is helpful.