... 4, Software easy to install 5, User friendly NameReal-time gps trackerFunction1,Positioning and Tracking2,Support GPRS and SMS3,Support ... automatically if GPRS drop4,Tracking by time, it send the location data to serve by time interval5,GPRS automatic re-connection ... 21.4KpbsParameterSupply voltage12V or 24VSupply rage10V/20V-33V It will switch to backup battery automatically if it under or high ...