That way if you had multiple alarms youd know which one was going off.
Some basic soldering know-how is required, but Suter provides a schematic so you know what pieces go where.
GSM Proximity Alert with GPS Location and Time| Instructables
Build a Motion Detector Alarm That Reports Time and GPS Location Data
If you’re looking for a way to keep tabs on what’s happening around you, this battery-powered, GPS-enabled motion detector alerts you of a breach via
