I have recently bought a used 2006 BMW 520D E61 and have found 2 devices wired into the electrics next to the rear fuse box.
One of these I'm pretty sure is a GPS and the other one looks like a speaker. Neither of these devices have any text other than the country of origin.
The GPS could have been left over by a previous owner if it had been used as a taxi or part of a company fleet. If so, would this be safe to remove? (There is a black sticky residue on it from where it was stuck to the car).
The other device I'm a bit more confused about, it seems to be a speaker but I cannot think of a reason that it would have been installed and therefore I am not sure whether it can or should be removed.
My questions are: What are these devices? Are they safe to remove?