The KNX RF / ENO Push Button 440 secure unites two wireless protocols in one device: EnOcean and KNX RF. Out of the box the push button operates in EnOcean mode. EnOcean Secure can be enabled via pressing a key combination. By configuration with the ETS® the push button switches to KNX RF mode with optional support of KNX Data Security. Via a factory reset the device can be switched back to EnOcean protocol.