The DCS 3000 code lock is perfect for outdoor use. The keyboard is effectively protected against sabotage by a metal front. The sabotage contact operates when the housing is opened to prevent interference with the system. In the event of a power failure the individual code is maintained for up to 48 hours. This may be a combination of between 1 & 12 digits. There is a jumper to set the voltage-free relay output to momentary or latching action.