(Belated) Thanks for the comments there, chaps.
On our other Volvo, wires dangling from the rear-view mirror (for dashcam) if wobbled could trigger the alarm. So on the C70 we were leaving them on the centre-console, seat or floor. AFAIK, the C70's sensor is aimed exactly there, below window-height (as I mentioned above: so it can be used with the roof down), so if they wobbled, they'd trigger the alarm. By tucking any wires away, we seem to have dramatically reduced the number of false alarms.
Still gets excited by loud motor bikes and reverberating lorries though.
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1998 V70 T5, B5234T3
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