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How does a two-wire (no neutral) smart switch power itself while the lightbulb is ON?

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How does a two-wire (no neutral) smart switch power itself while the lightbulb is ON?

So, I just bought a Sonoff T2 smart switch. Basically it replaces a normal light switch with a smart switch that can be flicked on and off remotely over WiFi. This is the two-wire model, since in this house the switch boxes don't have any Neutral or Earth wires - there's just the Live wire going...

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Wifi smart switch wiring diagram

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How to Install a Smart Switch!

How to Install a Smart Switch!

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