The knob cylinder is an electronic locking cylinder with
a single-sided electronic authorisation. The classic by
Uhlmann & Zacher for the modern locking system is
available in different versions. Various special lengths
and a wide variety of mechanical knobs are available.
The identification can be done by a passive
transponder or by a smartphone. In addition, a version
of the electronic double-knob cylinder with Bluetooth®
Low Energy is also available.

https://uundz.com/en/electronic-lockingunits/
lockingcylinders/ electronic-knob-cylinder