... SOSThree ports use to ExtendOutput I/O1 port (Control car engine)Microphone3.5mm Single trackearphone3.5mmCurrentStandby Current:16mAworking ... ( working time is about 3.5 hours)Accessoriesdevice, Connecting cable ,GPS antenna ,GSM antenna, Engine controller, SOS button, ... purposes.3) Due to Noran advanced technology, strict quality control management & competitive price, we gain orders from Government ...