... oil 2 way communication 1. Cut oil 2. 4MB Flash memory 3. 2 way calling function Vehicle gps tracker cut oil 2 way ... optional)Backup time: 20 hours4 switch input, 2 analog input, 2 digital input , 3 digital outputUpdate firmware via ... Tremble)/GSM/GPSI/O Port4 switch input, 2 analog input, 2 digital input , 3 digital outputExterior GSM antennaReceive ... .8kg Vehicle gps tracker cut oil 2 way communication