Features: Universal GSM four-frequency system. High sensitivity GPS receiver chip. Built-in high sensitivity GPS antenna with strong reception performance. High integration design. The vehicle terminal designed with a dual built-in antenna(GSM, GPS). Built-in switching power supply, ultra-wide voltage input range. The built-in vibration sensor to realize the intelligent vehicle security. Support ACC detection, vehicle start alarm. The external relay can realize remote control of vehicle oil and electricity. There are three specific Numbers for the SOS alarm and the burglar alarm. External SOS alarm button for emergency call for help. The external microphone can be used to realize remote voice listening. It has built-in spare battery to realize the illegal cutting line alarm. Compatible with serial communication of external equipment..