wiiyii Heads up Display for Cars, M19 GPS Digital Speedometer with Speed MPH, Windshield Projection for All Vehicles

Seems to be well made and is reasonably priced...A few notes...1. Adjust the speed control to 102 as the manual says... this seems to be the most accurate setting. When compared to a GPS speed app on a cell phone it was spot on accurate.2. The performance speed bar is rather silly (aka stupid).. always green...must have to go over 100mph to turn red.3. Overspeed alarm factory set at 120mph...really?... you'll want to reset that.4. The automatic dimming/brightness is very smooth and nice..be sure to go into settings and set it to "0".5. Did not use the projection film on the windshield...display on glass was bright and clear.6. Compass is nice although a bit small..also set for the travel distance. Nice you can choose from other options.7. Keep in mind this is GPS driven...if you go through long tunnels you may not get response. I've driven through short ones and is ok. Overall seems to be nice product and would recommend.Additional notes:Don't forget to remove the clear plastic protector film from the face of the unit beforeyou use it..Folks!!! this (unfortunately) is not a "plug and play " unit"...it must be calibrated and preferences set by the user!! Please read the user manual that comeswith it.I suspect the other buyers who gave it a low rating or threw it away didn't bother to calibrate/set it.

Does what it said it would do

Maybe I didn't adjust the brightness well enough, but this reflects off of the front windshield. It works great at night and isn't intrusive. However, when reflecting against the clear, bright sky, I couldn't see the data that was reflected.Customer service was very responsive and nice.

The speedometer reading is smaller than pictured. Daylight savings time occur and the time is still wrong after trying everything. The adapter for the cigarette outlet is oddly shaped. Debating on returning it. It is 3 to 4 mph different than my cruise control

This is a really nice product! It so helpful to see your speed without looking down as much plus the time

This product is wonderful!

This thing is garbage. went to test it and was going about 20-30 and it was 9-10 mph off

The media could not be loaded.  I'm using this in my vehicle since it didn't come with a HUD.I like the small form factor. It doesn't take up much space on my dashboard.I like that it plugs right into the cigarette lighter.It comes with a double-sided mounting pad.It comes with a piece of plastic film similar to a cell phone screen protector to stick on your windshield. The purpose of that is so the information being projected on your windshield is clear. If you don't use it you will notice the numbers and characters are doubled. I did use this without the film at first but it became uncomfortable after a while so I am using it now. The information shown after mounting the reflective film on the windshield is much clearer. This film must be used in the vertical position.Now as for setting this up, it was a bit of a challenge to set up mostly due to the user manual not being as clear as it should have been.This unit displays the time and the speed. As for accuracy of the information and specifically the speed I'm finding that this device is usually showing a speed that is most of the time on average two miles per hour higher than what my speedometer is showing. Occasionally the difference is 5 mph for a brief amount of time. According to the user manual it's possible to get this dialed in to match the speedometer but the manual isn't clear enough on how to get it dialed in.The double-sided mounting pad can be pulled off and reattached to the dash. It took me a little time to decide where I wanted the information to appear on my windshield and because of that I had to move and re-mount it a few times.The reflective film that goes on your windshield can be peeled off and adjusted but it is very sticky. You don't want to damage the film or have it peeling because it was removed too many times.At night, the film is less visible than in the daytime. From the outside during the day the film is more visible from the outside of the vehicle and looks like a small mirror. At night it's still visible but less so than daytime.One final thing I want to address: If you're wondering why the speed showing in my video appears just below the bottom of the reflective film, it's due to me having to lower my phone shoot through the steering wheel to capture both my speedometer speed and the speed showing on the HUD so you can see for yourself. (all while driving)Overall I am satisfied with this HUD.I hope this helps.