On/Off (simplebits.com)

I had the same thing in a couple of hotels in Sydney and Melbourne that I stayed at 2 years ago. Never seen this anyplace else though.

...

Well, hopefully that isn't the only way to turn the lights on and off.

These are common in China. The card switch acts as a master on/off for most? of the outlets and lights (except for the fridge?).

I forgot about it a couple of times when intending to charge my laptop while I was out.