I think the title says it all but if needed - I'll edit this. Of course I googled but I got nowhere. Google results were total shit. Google won't help me if I don't know the exact name for that fucking thing. It's a very stupid design choice. Five regular old push buttons would be so much better.

About an hour ago I managed to stick it back on but I'm nearly 100% sure it's going to fall off again in week or two if not far sooner.

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Edit

I don't mean part of the unit itself. I mean just the thin plastic cover over the buttons that's ~3mm thick.