About this item ? Suitable for All Cars. ? GPS + BeiDou dual-mode chip. can be compatible with all vehicles. no need to worry about compatibility problems at all.For example. new energy vehicles. hybrid cars. motorcycles. fuel trucks. buses. big trucks. etc. are all compatible. Using 10Hz high refresh rate for 10 frames per second. the car speed is refreshed fast and without delay. ? 2 Alarm Functions. ? Speeding alarm: Alerts drivers not to exceed the speed limit to improve driving safety. Fatigue driving reminder: The 4-hour continuous driving break reminder can prevent car accidents caused by driver fatigue. ? Adaptive Sensitivity. ? No matter day or night. still clearly visible.The compact body is suitable for placement no matter where it is placed. it is clear and natural. and does not any line of sight. ? Multifunction Speedometer. ? New intelligent GPS vehicle speed and time display. GPS vehicle speed. satellite time. comp. overspeed alarm. driver fatigue reminder. ? ? Speed Calibration Function. ? Accurate speed display. can be adjusted to be consistent with the speed on the car speedometer (GPS vehicle speed is approved by satellite signals! It is essentially very accurate. and no adjustment is required normally). ? Easy to install. ? 1. Plug the supplied USB cable into your car’s cigarette lighter. 2. Then connect the HUD. 3. Place the HUD where you want it to be.G4S Digital GPS Speedometer. Car HUD Heads Up Display with Digital Speed in MPH KPH. Overspeed Alarm. Driver