Few safes are left unattended for four days, so for most enterprising criminals, this cheap safecracker isn’t going to be a good meal ticket. There is, however, a faster way. Safe makers often ship safes that are set to only a few default patterns. The arduino on the safecracker comes with an SD card slot, so an attacker could load a memory card with default safe combinations and make sure the cracker tries those first. If the safe is still using a default combination, the time drops from days to minutes.