Pattern password lock design, seemingly lock-free but safe and worry-free
Korean designers brought a pattern door lock, which looks like an ordinary handle, with a simple design and no keyhole. However, if you rub it carefully, you will find several raised areas on its handle. Yes, the secret is hidden here. These raised grain areas are actually Braille. You need to twist the handle back and forth until the right raised point is felt in the palm of the hand, and the door handle lights up and lets you enter the door. Every time you turn the password area, the palm will cover it, so it is basically impossible to obtain the password through a helmet or other methods. The Braille password on the doorknob can form a maximum of 65820 combinations, and the probability of being cracked is unimaginably small.