Bio-Lever Decorative Fingerprint Door Lockstar rating 1Bill BelangerApril 30, 2009This unit locks itself when the door is shut firmly. In the dark, when you touch the keypad, it lights up but when you try to swipe your finger, the screen goes dark so you can't see a thing. I scanned my thumb 5 times, for 5 different "signatures"" and the unit recognizes it one out of 3 or 4 times. My family gave up on it."