Technical Question for TPLink Staff
The Device itself and the documentation shows the HS210 can be installed at either the Line-Origin End OR the Load end (and indeed the common terminal on the device is marked Line/Load)
Now obviously if connected at the Load end, that common terminal will NOT have voltage when the device is OFF
So .... does the device (controller and WifI) derive voltage from either of the Traveler connections alternatively to the common terminal in order to maintain power to the device control?
Intuitively it must - otherwise it would not work. But a confirmation would be appreciated.