Can I get some help on finding a wireless light set?

Hi All,

I am looking for wireless small red light I can activate remotely.

You see, I morning meditate in the living room and want to alert my
wife upstairs

to not disturb me until I am done.

I got this idea to turn a little red light on in the bedroom in case
she is still

sleeping.

Do you know where I could get such an item? (I have had no luck
scouring the web

so maybe not using the right keywords.

Many thanks,

Jim

.