When you want to use your VDO A+ series computer on another bike or replace a lost or broken holder. Kit comes with everything you need other then the computer itself to move your commuter from bike to bike or replace any broken or lost parts that the computer head attaches to. VDO is the leading supplier of automotive electronics and mechatronics in the industry. Taking all the innovation they have learned over the years and applying it to their bicycle computers.VDO is the leading supplier of automotive electronics and mechatronics in the industry. Taking all the innovation they have learned over the years and applying it to their bicycle computers.