They work with CFL's - they take their power from an AA battery. They
work in parallel(?) to the normal light switch ie you can switch the
light on and off normally, but if the timer says the light is on, you
can't use the switch to turn it off.


I use them on CFL's. I actually remove the normal light switch. You can use
them as a normal switch by pressing the MODE button - on, off, auto, random.
Mine take AAA batteries - very good they are too, as they will handle quite
a high current and can be used on socket outlets.



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