VisibleThe small size of 2.6 inches avoids obstructing the driving sight; which displays the information more clearly than the windshield HUD, it may make you feel more comfortable to monitor the speed and bring more fun to your driving experience. You can choose between white and green,, it's a good view to read the information directly without moving your eyes from the road, no need to paste any reflecting sticker on your windshield. Multiple FunctionsG1 contains multiple functions: Speed ,Driven distance ,Driving direction ,Automatic light sensitivity ,mile and kilometer ,sound alarm Switch ,speeding alarm ,fatigue driving reminder. The speed unit is KM/H or MPH, and the driver can switch freely according to his own habits. Alarm FunctionOver-speed Alarm and fatigue driving alarm to ensure your safe trip. Default setting is 120KM/H or 120MPH. You can adjust it according to your needs. When the product detects speeding, it will beep to remind the driver. Plug andamp; PlayPower through vehicle cigarette lighter. The G1 display the real and instance speed with GPS satellite. Compatible with all cars ,no matter which brand or which model all over the world cause G1 is based on the GPS module inside. Number of parts delivered: 1 Color: Black Product accessories: manual, non-slip mat, data cable