Its been beeping for ages and im sick of it, ive tried sliding as it says to but ive had no luck...
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I was wondering the same thing and noticed there is a little latch under the text "slide to remove" which had to be lifted (with a screwdriver) to get the unit out from the ceiling. At least in Finnish version there was a text "lift the latch to slide unit off" which I noticed when I took a picture below the lid.
I know it's an ancient post but I thought this might help someone! :)