Here are some wiring diagrams that should make it obvious: https://shelly.cloud/knowledge-base/devices/shelly-1l/#tab_62945037e3fa5 https://shelly.cloud/knowled

Here are some wiring diagrams that should make it obvious: https://shelly.cloud/knowledge-base/devices/shelly-1l/#tab_62945037e3fa5 https://shelly.cloud/knowledge-base/devices/shelly-1l/#tab_6... Basically the switch becomes a simple boolean input to the Shelly - the actual module is always powered. This allows you to turn it on via the network and turn off at the switch if you wanted to, or completely detach the switch from the actual light and only use it as an input to your home automation controller (maybe you want to use it to toggle a different light than the one it's connected to?). For no-neutral operation they sell bypass resistors that you can put in parallel with your light to pass through enough current to keep the Shelly powered on.