Hud Car Head Up Display G12 with HD LED Display for All Speedometer for All Speedometer Models, with Adaptive Light Sensing

Verry accurate gadget
The compass is verry accurate. I just wish the arrows moves and point to the right direction instead of turning the direction letters on and off. The speedometer is verry accurate as well. It gives 1 to 2 miles difference from my dashboard even before calibration. Over all this is a good gadget for its price.

Not a true HUD. Novelty at best
Pros: Clear displayEasy data change via top buttonSelectable on what to display (speed only for example)Auto dimmingHas GPS…will show exact coordinates (scroll to see Lat or Long)Mount sticks firmly to windshieldCons: Using the USB port means you can’t use CarPlay or Android AutoHas micro-USB port not USB-CSits on top of dash (not reflecting up onto windshield)Note: Requires a USB port that sends car data, such as Android Auto/Car PlayOverall, this is a bit of a novelty for someone who likes cars. This device isn’t a true HUD that reflects up on the windshield but sits on dash. Still, it provides lots of data that you can choose to display or not using the top button. I found it to be more of a distraction than helpful.Plugged in and it turns on instantly. Various display data, such as speed, direction, rpms, etc. can be chosen to be displayed or not using the small wheel at the top. The screen is easy to read and will be bright enough to read on the sunniest of days. At night it will dim automatically via its light sensor. It has no vents but didn’t get hot or even warm. I am not sure how it will hold up on a hot summer day though.I’d say this would be great for an older car, giving you a digital display, but older cars probably lack not only a USB port, but a USB port that sends car data to attached devices (like android auto). For newer cars, I don’t see the point in having this device.Bottom Line: Will make a fun gift for someone that loves cars or gadgets.

Display somewhat confusing in daylight. Compass arrow ALWAYS points north.
The display on this unit can get a little confusing, as there is a lot of information displayed at once. Fortunately, you can toggle through a bunch of display modes until you find the one that works best for you.I settled on just turning off the “# of GPS satellites” displayed in the lower right. That seems meaningless. If the unit cannot detect enough GPS satellites, it will simply not display any data, at all.This display is not a color LCD as used in smartphones. It is simply LEDs behind multicolored transparent plastic. There is nothing wrong with that; however, in the daytime, the portions of the display that are OFF are almost as easy to see as the parts that are ON. You can see everything, with the illuminated elements just being brighter than the others. For example, if I am traveling at 10 MPH, I would still be able to see the leftmost 1 numeral and the leftmost portions of the other 1 numerals. (just a bit dimmer). This happens with any display element that is not lit up. Yes, everything is understandable, but you have to train your brain to ignore the dimmer display elements. That happens only in daylight; at night, there are no issues.For another reason, the compass is very confusing. It took me a while to realize that the red arrow ALWAYS points to north. The proper letters of N E S W will light up, but again, it becomes confusing in daylight because of all of the letters being somewhat visible.Someone else mentioned that the unit gets information from the USB connection. Sorry, but that is totally wrong. It does not display RPMs, either, as that would require data from the car’s computer. It only gets power from the USB port, no data as all. I tested it using a USB power bank while going for a outdoor walk, and it works exactly the same. ALL of the information comes from the GPS satellites. By checking the GPS coordinates, it can figure out what direction you are moving and how fast. The time, elevation, and other data are either directly received from the satellites or calculated from the received GPS data. There is no data whatsoever supplied by your car. You can get apps for your smartphone that can duplicate every function of this device since they also have built-in GPS receivers.This would be a great upgrade for an older car or for one with a broken speedometer, clock, etc. There really isn’t any function provided by the unit that a car made in the last decade wouldn’t already have built into the instrument panel.