To add to my review above, I've just been reading other reviews on QVC, which reminded me that I WOULD NEVER USE THESE OUTDOORS! IP44 means resistant to occasional splashing. Many of the reviews say they failed when used outdoors.
ALSO many said the batteries did not last long on auto. Mine have been switched off for years, and worked fine when I turned them on. But when on auto, there is bound to be a small drain from the battery just to power the sensor, so even if they hardly ever come on, the battery could go flat.