1. Functions: speed, clock, compass, single mileage, travel time, number of satellites, altitude, 0-100km/h acceleration time 2. Alarm: speeding alarm, fatigue driving alarm 3. Display of different functional interfaces Speed + time + compass + number of GPS satellites + atmosphere light Speed + travel time + atmosphere lights Driving direction angular velocity + compass + altitude Speed + travel distance Speed+compass+100km acceleration time+decoration Speed + atmosphere light Speed + Compass + GPS Satellite Number Simple speed 4. Vehicle performance test: The time required to accelerate from 100km/h is an important reference data for vehicle dynamic performance and testing. The time and distance used by the car are from 0KM/h--100KMh. Specification: Material: ABS+PC Colour: Black Product size: 16.8cm*1.6cm*4.3cm/6.61*0.63*1.69" Packing size: 14.3cm*9cm*5.1cm/5.63*3.54*2.01" Product weight: 140g Packing weight: 140g Applicable scene: suitable for all automobiles Note: There may be slight size deviations due to manual measurement, different measuring methods, and tools. The picture may not reflect the actual color of the item because of different photographing light, angles, and monitors. Packing list 1 X HUD 1 X USB Cable 1 X Adhesive Tape 1 X Manual