... Track by Time Interval 4.Built-in Super Magnet Optional Tracking device micro gps blind area alarm Product DescriptionGT30 is a ... or Sending MessageBuilt-in Super Magnet (Optional) GPS Tracker,gps tracking,tracker,vehicle gps tracker GPS module: SiRF Star III GSM ... and rechargeable internal battery Re-branding acceptable GPS Tracker,gps tracking,tracker,vehicle gps tracker GPS module: SiRF Star III GSM ...