High integrated technology in synergy with timeless ergonomic design. This new KESO security product is able to grade up pure mechanical master key installations to a level of modern mechatronical systems, also retroactively. Without cabling on the door during installation, this cylinder additionally supports comfortable functions like immediate blocking and timely limited access. KESO sets once again the benchmark with the design and material selection of this door component. The universal construction completed in classy processing fullfills the physical building and architectural requirements on a high level.