... based service)12. LED Advertising Screen, RS232 Printer, Temperature sensor, RFID (optional) Positioning and tracking: through the online positioning ... D Input port( Fuel monitoring)1 Output port ( Car engine control )3 Extend ports ( Input/Output control by software ... :400mA( working time is about 3.5 hours)AccessoriesDevice, Connecting cable ,GPS antenna ,GSM antenna, Engine controller, SOS button, ...