You can connect different external devices to Queclink GV600MA NB / IoT GPS tracker using the (RS232) interface and improve the features to dispose of much telematics data that GV600MA can extract of the external devices. GV600MA of Queclink can working using the vehicle - trailer power source and when GV600MA detect that the power source is disconnect, activates the "Standalone GPS" mode using the rechargeable 5800 mAh backup battery to continue with your Fleet management without lost the data communication. Increase your trailer - vehicle safety configuring the preventive "SMS alerts" in Queclink GV600MA NB / IoT GPS tracker: (digital / analogue inputs alert, speed alert, movement alert, low backup battery alert), the SMS alerts are send to your mobile phone. You can locate GV600MA device in real-time sending SMS text messages with commands, from Queclink server or change IP and port in the configuration to use GV600MA in an external Tracking Management Platform. If Queclink GV600MA NB / IoT GPS tracker lost coverage with the (LTE Cat M1/NB1) networks pass to data transfer through (Bluetooth BLE 4.2) connectivity assure that you can continue in your Fleet management.