I have 3 days ago purchased the Central by the dealer "cleanbuy" of plus offers a 9 page long instructions from its download area. Installation is really an act in itself and can only be recommended if you really familiar with his vehicle or is not afraid that perhaps no longer regards it as an afterthought. After measuring the operating voltage and connecting the receiver to a suitable cable you quickly realize that it works and can test euphoric before the operation of the engines. The programming of the hand-held transmitter works also without problems. The only thing (me) really has difficulties, was the wiring through the door and the installation of the engine in the door itself. Mag but on my car (Nissan Micra K11 BJ. 97) lie. All in all, but can be said is that thing once in it, it is just great and helpful. "Click" on both doors, "Click Click" both again. Then the connection to the indicators system and the part does the job perfectly.