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sorry for the oversized writing but this has been covered hundreds of times on here. The B2 will pick up everything that uses laser eg. handheld guns, mobile vans. Also picks up gatso/truvello/schools/blackspots/specs cameras etc.
the additional unit is a radar detector if you want it, but not much uses radar any more.
http://www.RadarDetectors.co.ukwww.RadarDetectors.co.uk for lots of comparisons and unrivalled unbiased information, as well as details of the different types of camera in use.