The FE595 has flex lock whereby the inside thumb turn determines whether the lock is in a locked or unlocked state. When the thumb turn is horizontal, the lock is in the locked state, requiring a code for entry. When the thumb turn is vertical, the lock is unlocked and can be opened without requiring a code.
The FE575 is always in a locked mode and will always require a code for entry. This lock can never be placed in an unlocked or passage state.
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