Your SimpliSafe Do-It-Yourself Security System allows you to use up to 5 PINs, so that you can designate personal PINs for different roommates, a landlord, etc. In addition, you can choose to select a duress PIN. The duress PIN is to be used in the event that you are forced to turn off the alarm against your will. This PIN will turn off the alarm siren, but will still send the alarm signal to the dispatch service, who will immediately dispatch your local authorities.