... can set up barriers when the tracker is stopped. Once moved, it can give an alarm to the authorized number.*Over ... speed. It alarms when speed is exceeded.*Low battery alarm function*SOS Alarm*Remote Engine-stop and Resume with 12V relay ( optional ... monitor tracking software), 1 external GPS antenna , 1 external GSM antenna,one 12V relay,1 cable Portable car GPS tracker with magnet ,battery standby ...