4 Black+Decker 3 in 1 air conditioning unit Posted by Michael Chapman on 16th Apr 2020 First a/c unit I have tried so cannot provide any comparison. It works very well but I had to deduct a star because of the poor instruction manual. Took me ages to connect the hose and still not sure I have done so correctly. Manual says remote takes AAA batteries (which would have been nice) but it takes a CR2032 (not supplied). Manual also talks about Louvre control which doesn’t seem possible. I found that I had to weigh the hose down where it went through my open window to stop it falling back into the bedroom.