Going from the yellow warning triangle on the device my guess would be that it is laser that marks dot or line so that you can line up car in the centre of garage.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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