Free AirKey app for Android and iOS smartphones turns your phone into a key to an electronic cylinder. Besides, the phone is used as a “bridge” between the system components (locks, keys) and the cloud.
In case your smartphone is running Android version 5.0, only NFC technology will be available. To use Bluetooth technology you need to have Android from 6.0 or iOS from 10. NFC technology is available only for Android smartphones.