Assa Abloy, Aperio BLE Online Metal double knob cylinder V3, C100 Euro-profile, single-sided RFID cylinder length 35x45, iCLASS / ISO 14443B, iCLASS Seos, MIFARE Classic, MIFARE Plus, MIFARE DESFire EV1, LEGIC Advant RFID technology. Aperio is the tool needed to put the Batteries in, ref. no. 40020127