The hybrid cylinder allows even better modular combination of electronic Xesar and AirKey cylinders with mechanical EVVA systems. This opens up a number of new applications. For example, in private properties or in public buildings: the benefits of electronic access control on the outside and conventional mechanical locking systems on the inside. Or as a special solution for the fire department: emergency lock on the outside; electronic, time-based access control on the inside. With the Combi Key you can control both with the one device.