How does a light with two switches work? For example, the light at the top of the stairs might have a switch at the bottom and the top. - Quora
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Lsaardth Staircase Switch - AC 220-240V Mechanical Home Appliance Staircase Electronic Relay Time Switch Mechanical Home Electronic Relay Time Switch for Home Stairs Staircase : Amazon.co.uk: DIY & Tools
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Staircase Wiring Diagram - Controlling a Bulb from 2 Places | Electrical wiring, House wiring, Electrical installation
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