Vdo presents a new product line the m seriesvdo m4 compact housing but a large displaythe vdo m4 is a model specifically aimed at the target group of road bike riders and impresses with its small light structure and easy to read portrait format display with large digits this display always simultaneously shows three 40vdo m441 functions so that all key data is always in view while ridingall the important bike functions such as the speed average speed maximum speed ride time ride dist