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NOTICE: DOUBLE SYSTEMS OF OBD2 AND GPS, COMPATIBLE FOR ALL CARS. PLUG AND PLAY, 11V~18VDC (12VDC/200MA), PLEASE USE THE USB CABLE WHEN VOLTAGE HIGHER THAN 24V. M7 HUD OBD2+GPS with glare shield, it displays driving data on the front windshield such as speed, Engine RPM, mileage measurement, water temperature, voltage, avoiding drivers looking down to see the dashboard.Specification:1.Terms of Use:Environment temperature:-40C to +80C Barometric press: 86-106KPaRelative humidity:10%-95%Environment voice: