Does the physical wall switch needs to be constantly on?

So I just received my yeelight v2 bulbs and they are great!
My question is if there will be any problems when I leave the wall switch constantly on, and turning the yeelights on/off using the app. Will my elecktricity bill increase???

Thanks in advance!

There should not be any problem in keeping the wall switch, if you switch off then communication will be lost. Regarding electricity yes there should be some minimal watts.

Ok, good to know!