M1 White Windshield Projection Heads Up Display, Digital GPS Speedometer with Speed, Travel Direction Function, and Overspeed Alarm, Fatigue Driving Alarm， Suitable for All Vehicles

Why did you pick this product vs others?:this is a really neat gadget. it has a working gps system that is more accurate than your speedometer.Functionality:it is just plug and play. no real programming

This unit never fails to connect to GPS signal. But, out of the box, the speed indicated on the unit was about 5mph fast. The directions which come with this unit were not very clear. Now, I have a unit which indicates KPH. Can't get it back to MPH. So, I've needed to memorize KPH readings to MPH speed. Unit is bright enough to view even in full sunlight. I have the unit reflect off the windshield glass, not the little stick-on the windshield panel. Even so, this unit meets my needs. I just wish the directions were written by someone who's first language is English, not their second.

Practico, economico, super facil de usar, excelente calidad,conectado en el encendedor del auto, solo asegurarse que el lugar donde lo conectes, se apague al apagar el carro, de otra manera seguira trabajando aunque el auto este apagado, y eso descargara la bateria de tu auto

Once you switch this to kilometers you cannot get it back to mph. Might as well wipe your but with directions because you can’t see what it says and it makes no sense at all under magnifying glass. Also speed once over 50 jumps to 70- 80. Cannot correct says you can but you can’t. Stay away from this garbage!

Works OK, has the slowest GPS seek and updating that I've seen this century. But it works, has a good display and is nice and simple.

Considering a lot of newer cars are actually coming with this function built-in the fact that I can buy it and add it to my early 2000s vehicle. It just gives me peace of mind the ability to see my speed without having to look away from the road is priceless.

I'm pleased with the brightness, but this thing is impossible to accurately calibrate. At 40mph, it is dead on. At 50 and above it is consistently 3mph faster than true speed.

Love this item The numbers are clear and bright even in the day. I will admit I have a light tint on the windshield that helps a lot. Love it