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HEMS, the vendor, answered my enquiry. There is actually a clip (first image in the original question) with an arrow mark on it. The problem is that the mark is uncoloured, very difficult to be noticed from where I stand. Push the clip to the left to release the lock, then pull down the whole thing.


Try simply grasping the lower portion of the detector unit and then try to turn it left or right. It may turn a short distance and then simply pull straight down. AC Powered smoke detectors like this almost always have a plastic receiver piece that screws to the ceiling / electrical box. The AC power wires attach to a short harness and connector assembly ...


My suggestion is that you try pressing in (or up) on these two tabs: And then that the lower part of the unit will hinge down. The hinge edge being along here:

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