On 27/11/2019 22:17, Dave W wrote:

What do you mean by "secure enough"?
The number of combinations of 4 digits is (10x9x8x7)/(4x3x2)=210.
For 5 digits it's (10x9x8x7x6)/(5x4x5x2)=252, which is hardly better.

A lot of push button models have more buttons than the 0 to 9 digits.
Mine also has a hash and a star button that can be part of the
combination. Other models have equivalent extra buttons although I have
seen some cheap ones without additional buttons.


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