EVVA AirKey hybrid cylinder with E-outer knob and mechanical internal lock, available as EVVA MCS, 4KS, ICS or EPS system : Amazon.de: DIY & Tools
AirKey - The Smart Locking System from EVVA | EVVA
EVVA AirKey MB19-S Lever Cylinder 19 mm Diameter, Electronic Lever Lock for Mailboxes, Display Cabinets and Much More with Bluetooth, NFC, RFID : Amazon.de: DIY & Tools
EVVA Airkey Smart Euro Proximity/ICS Key Cylinder | Safe