... the GPS unit does not vibrate or ring )Fuel Monitoring: Remote monitoring vehicle fuel (oil, oil spills, oil steals, ... Current 16mAworking Current:60~150mACurrent of opening infrared of Camera at night :100~200mACharging current: Max<500mABatteryLithium battery ... antenna ,GSM antenna, Engine controller, SOS button, Microphone, Camera, LED advertising display(optional) Application Area :Taxi companies, ...