Easy to install once you figure out the existing wiring for this single pole 1-way light switch. Neutral White wire is most important w/o it dont bother installing since Neutral supplies power to WiFi switch while light is in OFF position.
[Kasa HS200 Switch vs Junction Electrical box colors] Green/Copper - Ground, White/White - Neutral, Black/Black - Live, Black/Black - Load.
Hooking to WiFi is super easy once Kasa account is created using the Smartphone app. Connected to my home 2.4Ghz WiFi since most devices support it.
As you can see in the pictures I did not use the face plate that came with the Kasa box instead screwed back the 2-gang Leviton Decora face plate. Fits perfectly no gaps