https://www.thehomesecurityadvisor.com/xfinity-home-security-reviews/
OFF — When your Xfinity Security system is switched off, many of these alarms are still active. Your Comcast Security system will still alert you if a doorway or window is opened. Additionally, the environmental and life security systems (i.e. water or low temperature) are still active.
Stay– You can arm only the perimeter protection in the windows and doors by arming your Comcast Alarm system in the "stay" mode.
Away– The away mode will trigger any interior motion detectors in addition to the windows and doors.
Instant –You are able to eliminate the entry delay in your Xfinity security system by arming it in an instant manner.
Duress – You may establish a special duress code which will notify the Comcast Home Security monitoring center that there’s a possible hostage situation.
Panic- The Xfinity Security system is also equipped with emergency panic buttons.