At Bentleys recommendation I purchased a Calibre K-40...big mistake.High cost, poor result...on 6400 mile trip in Continental GT, 54 false alarms, 50 identified fuzz (maybe some with radar off), one gotcha(no ticket), no laser signals. Calibre installed a new unit at no charge which is slightly better, but not adequate. Problem is my Valentine will not work thriugh the Bentley windows, nor will a Garmin GPS.More later