For this retrofit there are no installation instructions. To be installed by skilled personnel only, best by a BMW partner. BMW is unable to accept any responsibility for operating failures and damages resulting from incorrect installation. Installation time approx. 0.25 hours, which may differ depending on the condition of the vehicle and the equipment in it. The desired variant can be freely selected EC = Electrochromic Radio = Radio remote control LED = LED for anti-theft alarm system GTO = integrated universal remote control/garage-door opener FLA = Autobeam Compass = Digital compass display ETC = Electronic Toll Collection TLC = Lane Departure Warning