What’s this switch?

[James Hammond]

Hi all!

Random one, moving into a new house and have done the general walk around. The house is about 5 years old.

Noticed in the master bedroom the attached switch/button fitment (image)

Does anyone has any idea what it could possibly be for....? I’ve asked the wstate agent as the previous owners have done one of those part buy/part rent scheme things and the home group people who now own the house haven’t got back to us and the agents have no idea.

Any ideas would be greatly received. Thank you in advanced
J

 

[Simon India]

I don't know what it does every time I press it the lights dim and I can't see.