A high-quality mechanical lock cylinder and an electronic access control have been conflated into a mechatronics cylinder. The electronics – optionally available with a remote module for online connection – is packed into a housing which is stuck to the cylinder at the inside of the door. It provides quick and easy installation without drilling into the door. The cover can be removed for changing the battery. Common mechatronics cylinders need a large rotary knob at the outside of the door, including antenna and electronics. With the mechatronics cylinder, the authorization can only be perceived due to the black antenna.