Originally Posted by fietsbob

I like my B&M 4D senso.. 2AA use .. what battery you like. German , rack mount.

Only blinks in tunnel mode .ie On but light sensor leaves it off, in senso mode, but enter a dark tunnel it blinks .

then off again in daylight. at night in that mode motion sensor turns it on , then off again when you have stopped
for more time than if lust at a stoplight.