For specific use in the electronic security industry, particularly by those who use the following intruder alarm control panels:-Aritech: CD72, CD95, CD150.Ge: ATS, ATS Advisor, ATS Advanced, Alliance, Challenger.Guardall: RX16i, QX32i, PX48i, PX80i, PX500, PX250HS.Displays the dip switch settings for the zone/output expanders available for the above panels along with the relevant zone/output numbers.Will also show the expander number for a given dip switch setting (useful when trying to identify an un-labeled expander).UTC Fire & Security, GE, Guardall, Interlogix, Aritech