GPS tracker with two-way audio function/AD detection function

Model Number: Astro 301# Brand Name: Astrolabe Key Specifications/Special Features: FeatureIndependent CPU, industry grade designGSM: 850/900/1800/1900MHz quad-bandBuilt-in GSM antennaTwo GPS antenna, once built-out GPS antenna is cut, built-in GPS antenna can switch to start working automaticallyHigh sensitivity GPS chipsetWeb-based online tracking systemTracking and setting App for Android and iOSHigh sensitive sensor for speeding, vibration, power cut-off alarmGeo-fence alarming function
SOS button for emergency alarm
Two-way audio function
Acceleration sensor, can detect hard brake, hard acceleration, sharp turn wrong driving behavior
Buzzer alarm function to report wrong behavior
ACC status detection and alarm
Remote tele-cut off function
LED showing working status, can hide LED by command
SMS/e-mail alert
Uncap alarm, GPS antenna cut-off alarm, GPS module abnormal alarm

Remote control door open/close function
1 Rs-232 port, can connect Rs-232 attachment
1 AD detection, can detect oil tank
1 temperature sensor, can detect temperature
Upgrade firmware over the air

1 RS232 interface
1 temperature sensor
1 AD detection interface (oil detection)
8 IO (SOS, ACC, cut off oil, close/open door, anti-remove off)
buzzer (wrong driving behavior alarm)
2 self-defined IO
1 microphone port
1 louder speaker port
1 USB interface