Well five digits and 252 combinations isn’t so bad is it? So you can only set a button on or off – you can’t set it more than once, nor can you set the combination order.īest idea is to not use this type of key lock box! If you really need to continue using the box, don’t use a four-digit combination as that is the most common choice – set five as that gives you the maximum 252 combinations possible. A combination is set (or reset) by changing the direction of the arrows for numbers in the combination. The inside of the lock box lid has a cover which, when opened, exposes 10 screws corresponding to the numbered buttons on the keypad. Shockingly, the total possible combinations when four digits are set is only 210. Okay well that still means there are plenty of possible combinations right? Wrong! The number sequence can’t be set, so if you set 0123, the codes 0231, 0321, 3210, 2310 etcetera, would also work. If a four-digit combination was set, you would guess that it could be anything from 0000 to 9999 right? Wrong! Only one number can appear in any combination, so the first number that can be set is 0123 and the last number 6789. This is a metal box, usually fixed to the wall by the front door, with ten buttons on the front which you press to enter the secret combination. This is the type of key lock box I’m talking about. Popular with Airbnb hosts, realtors and those looking for something better than a key under the mat – key lock boxes are not as secure as you might think.
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