Digital Key Unlike a mechanical key that can be duplicated, a digital key can not be duplicated. It is registered and managed by Unilock's Owner-Key, Master-Key, and User-Key methods. You do not need to replace the lock GK91RFID Key (RFID key proximity or insert type) GK92ARRFID key & Loss prevention Tag (RFID key proximity method) GK92PKIC key & Loss prevention Tag (IC key insert or touch type)