3.5" Car HUD Head Up Display with OBD2/EUOBD Interface Plug & Play Vehicle Speed KM/h MPH, OverSpeed Warning, Water Temperature, Battery Voltage, Mileage Measurement

Installed in a 2015 Traverse in 2 minutes. Fooled around with placing it, getting to know it and adjusting it for maybe a half hour. First, short answer, -yes it works great. More on that later. Also, mine arrived already set to MPH instead of KPH, so apparently they've figured out to do that for units being sent to America so you don't have to bother doing it. Also, I am one of those people who just wanted my speed up on my windshield. I don't give a dipsy-doodle about anything else it can do and actually turned off everything else it can do. So this review is for it for use as a speedometer, which it does superbly. Before the glowing review part though, let's address a few things I read about in other reviews that had me wondering:1. Brightness/visibility: Consider first that every windshield is a little different, meaning how tall it is, what angle it's at, etc, -and that all contributes to how things (including the dash itself) reflect up at YOUR particular windshield. So anyone saying it isn't bright enough or can't be seen, -not true unless you either got a defective unit or happen to have an impossible vehicle to find a spot to place it. I left the cable loose and drove around for awhile trying out different places to put it and found what is ideal for me and my car. There were a couple places I tried that yielded "so-so" visibility, and I found several that were just fine, and one that's perfect for me. Driving directly into the mid-day sun I can still see it ok. Any other lighting conditions it's far beyond just ok. I happen to have crappy eyesight, so if I can see it at high noon, you should be able to as well! In fact, I would advise setting it up during mid-day sun, because once you find the right spot to see it then, you know you will be able to see it at any other time of day.2. "The sticky stuff doesn't hold it to the dash". Come on man! Maybe the sticky pads that come with it do or don't work, but I wasn't going to put ANY kind of adhesive on my dash that might leave future residue. Go to Wally world and spend 2 bucks on some command strips for gosh sake. Works great and will pull off cleanly some day if/when I want to remove it without leaving a trace! I still have some command strips left over for hanging pictures even. This stuff isn't rocket science!3. "It's impossible to learn to get around in the menu". Ok, first, it's not that terrible. Second, -how many things have you bought from China and have you EVER gotten a Chinese "manual" that anyone could clearly figure out without doing some liberal deciphering of what you think they mean? Push the button/"wheel" thingy in and hold it till the display goes to the number one. Now look at the little chart in the instructions which actually clearly tells you which number pertains to which function the unit does. move the button/"wheel" thingy up or down to get to the number that corresponds to what function you want to adjust. (Example: scroll to number 2 to adjust the calibration of the speedometer). Once at the function you want to adjust, press the button straight in. It beeps and the speed calibration pops up set to 108. After a little trial and error I set it down to 105 and it now matches my vehicles indicated speed on the dash exactly at 70 mph. Once you're done setting whatever it is you're adjusting, press the button straight in and hold it in till the display goes blank for a second. Let the button go and that's it. You adjusted whatever it is you were adjusting. Nothing scary or weird about it. Just typical Chinese instructions. And I would add that I doubt there's any better instructions with any other Chinese unit you're going to buy, so... - Like somebody else said, I won't be scared of the Chinese taking over the world until after they can make clear intelligible instruction manuals!4. "You can't turn off the overspeed alarm". That's true. UNLESS you scroll to number 8 on the menu and turn all the alarms off because #8 is for all alarms on or off... I mean... Not sure what the "problem" was supposed to be here ???5. I found absolutely no need for the reflective film. Whatever "ghost" image might be there is insignificant.Let's see, what else? I actually compared the readout from this, my dash, and one of those radar speed sign things by the side of the road. Result? You can match your speedometer exactly at say 70 mph, or at 30 mph, but probably not both, because that's just how speedometers work. It will probably be off slightly (1 to 2 mph) at either high or low speed so choose whether you want it right on at high speed or right on at lower speed. I chose to match my vehicle speedometer at 70mph, which puts my indicated 30 mph speed 1 to 2 miles per hour lower than the radar sign thing says I'm going. Close enough for the girls I go out with! AND, even the girls I go out with are smart enough to know that if this thing says 70 we're going 70 but when this thing says 30 we're actually going 28 or 29... Compared to some of the reviewers here, the girls I go out with apparently are rocket scientists!Conclusion/Glowing review: if you can live with a typical Chinese instruction sheet and it being right on at 70 and off by one mph at 30, I would have to say it works absolutely fabulous! It is SO nice to just keep eyes on the road while driving and adjust speed without looking away! -AND, the chicks will think you're a freekin rocket scientist for putting this sophisticated piece of technology in your car all by yourself! Win/Win/Win! 5 stars!

The media could not be loaded. A great device and with clear instructions, It is simple and none-distracting.The only setting up I had to do was changing it from kph to mph and adjusting the 'offset' so that it matched the built-in offset of the car. Offset is the difference between the data provided by the engine and that displayed on the dash - speedometers are always set a little fast and I wanted the speed indicated on the HUD to be consistent with the car's speedometer to avoid any arguments with advanced driving examiners. It was simplicity itself to tweak this by trial and error - make a small adjustment and go for a drive. After three short drives I'd got it right.Like most electronic devices it gets carried away with its own cleverness and gives far more information than necessary - I really don't see the point of measuring fuel consumption in litres per hour and having it on the head-up display. All I really want up there is mph only.I did not use the reflection film, there is a bit of double image due to glass contruction, but I personally find that to be quite acceptable. The display on the windscreen works well, despite having a slight double reflection due to the windscreen make up. I don't find this distracting and have not bothered fitting the clear film which is supposed to eliminate this. Reflection works very well at night where the automatic dimming function kicks in, and during the day is clearly visible except when driving directly into the sun. Under these circumstances it is difficult to see though not impossible.Overall, I'm impressed with this unit and it was well worth the money and effort. As for head-up displays I'm definitely a convert. For the short moment in time it takes me to refocus my eyes on the display and back to the road again the vehicle in front is always in my line of sight, unlike having to look down at the speedometer where your eyes off the road even if it's only for a second. Is it absolutely essential? No, it's more of a nice to have, but I get the impression that if you took it off me now I would miss it.

I have only had this unit a couple of days, after returning a $2 less expensive one that had poor instructions in broken English, and a slight double image because they didn't include the reflective film. This one is a much better value and works well.I have a question. If my speedometer reads 69 or 70 mph, and the HUD reads 73, what calibration setting should I use to make them match?I believe there should have been more precise instructions for calibrating it, with at least 4 or 5 examples of speeds and settings, so one could tell which direction to go from default, instead of the guess trial and error method they mentioned.UPDATE AFTER 2 WEEK'S USE:I have had the unit a couple of weeks now. Using the reflective film provided makes the speed display clear and sharp. This should be standard equipment in all 2018 Toyota Avalons. When merging with traffic with the cruise control on, the cars's digital MPH does NOT show, and the speedometer is partially obscured, making this HUD ideal for my needs.It is so handy and so much safer to be able to set the cruise control, especially when merging onto an Interstate, without taking your eyes off traffic to see the speed shown on the dash.I still haven't received an answer as to how to calibrate the speed to 106, but it is a definite KEEPER, even when it reads 73 when my speedometer display says I'm going 70.I would give it 5 stars, except I still haven't gotten clear instructions of the specific steps needed to get to 106, which I have so far been unable to find.HELP PLEASE.At least the instructions were in clear English.I asked the other company and they said set it at 106 but I couldn't follow their instructions to do it, either.