VDO presents a new product line Â- The M series VDO M1: all basic bike functions & a display with one huge digit The VDO M1 is the entry-level model in the VDO M-series & impresses with its compact linear design & flat structure. The brilliant portrait-format display uses large letters & a specially developed font to show only one function making it easy to read even while cycling. Available in both wired &40;WR&41; & wireless &40;WL&41; versions the VDO M1 entry-level model is aimed at a target group comprising everyday & recreational cyclists. The VDO M1 has five functions: speed ride time trip distance total distance & time.