In Asian and European hotels, there is a master switch near the front door of each guest room that is triggered by the insertion of a hotel key--when then key is not in, neither the lights nor air conditioning works. It allows: (1) to always remember where one put his key and (2) to shut down lots of energy use on departure.
It is such a hassle free way to save energy, I am not sure why these devices aren't everywhere.
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And in European public restrooms, the sinks and toilets are actuated by simple buttons or levers that you step on. Simple and sanitary, and can't be left on.
Here in the US we get kludgy motion sensor valves that often don't work, and in many cases have batteries that must be constantly changed.
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