Car GPS Mobile Head Up Display Holder with HD Image Reflection for HUD, Smartphone, iPhone, Samsung, Car Navigation (Up to 6 Inches)

Seems accurate once you calibrate it. Switching from metric to imperial was easy. It has one little thing that's annoying, once I exceed 80 MPH the tachometer goes away but comes back once you drop to 79. Not a big deal but I bought the device for the main purpose of seeing the RPMs on the windshield so I don't have to keep looking at the dash when I drop a gear to pass on an incline. Maybe it could be fixed if I were to ever read the manual. hahahahaha

Worked fine for about 2 weeks, then began to randomly change settings. Now it reads KPH instead of MPH, and when I'm on the freeway doing 55, it says I am travelling at 213 KPH. It randomly shuts off, restarts, or fails to turn on when I start my car. It is basically a POS that you should not waste your money on.

I bought this for my RV before a cross country trip because my speedometer is hard to see with my sunglasses on and the tilt wheel down, which is what I prefer. Super easy, just plug into the OBD port under the dash. It comes with a small reflector screen like a screensaver for your phone that you affix to the inside of the windshield. It showed speed, RPM's, volts and water temp. It does read a little high....at 70 mph on the dash speedometer and with cruise set on 70, this devide read 75 mph. Error seems less (+2-3 mph) at lower speeds. Anyway I just mentally adjusted the math. It was a great help on the road, lessened the driver fatigue for sure. The instructions stated that it may read less than the dash gauges.....I don't know if it is because it is cheap, or if the data from the OBD port causes this. Either way it's a cool gadget.

I tried this alongside the ACECAR offering. This is the clear winner, for a couple of reasons. The speedo and tach are a little bigger, but are also quicker - it may poll the OBD-II data every 0.5s instead of 1.0s. There is a significant lag on the ACECAR offering that makes it largely useless for monitoring around-town road speeds. Also, the ACECAR unit only visualizes 500RPM increments, which, together with the delay, makes the tach altogether useless. By the time the ACECAR readout catches up your engine may have increased or decreased speed by 2k RPM. This unit reads out RPMs in 250RPM increments, and updates much faster, which, together, means it really is useful as a gauge at any road speed. It doesn't have cardinal directions as the ACECAR does; it shows fuel economy, but in terms of L/100km, which is not especially useful in the US. The only potentially useful aspect is that it shows you real-time economy, so you might get some sense of your general economy. It also has a trip computer, which is helpful, but again, in km only, so, it's not going to be useful with respect to your nav unit, maps on your phone, directions, etc. Engine temperature, in degrees Celsius, is also a useful reading, and may be consistent with your instrument cluster if you're in a European car. Given that it is bigger, easier to read, updates its readings more quickly, and that all of the data displayed is helpful (although the color scheme is a complete mess and it's only in metric / European units), the reasonable price, and ESPECIALLY given the lack of better competitive offerings, this is a solid 4-5 stars as of June 2020. I'm opting to add this to all of my cars that don't have a HUD. It's simple, easy and useful.

Update1: After contacting the seller about the defective product, we came to an agreement to send me an updated model and refund me the cost. Once I receive it, I'll update this review again with any additional information. I had been using this product for the last two months and was going to right up a decent review until Monday morning, eight weeks after I received it. I got this product after doing research on all the other HUDs that Amazon offered and this one seemed to do what I needed it to do. I drive a 5-speed 2005 Elantra and ordered this HUD based on it's display, the colors and information it presented. When I received it, it seemed like a pretty basic setup; cable with ODB2 connector on one end and a mini-USB plug on the other, the device itself, a sticky pad to keep it from moving around on the dashboard (although, it was designed to lay on a flat dashboard, so if you have a curve over your instrument panel, it makes it harder to place and display the information correctly), and a polarizing sheet to eliminate the double reflection from the window. I initially ran the cable along the outer edge of my dashboard, along the crack between the door and the dash, and then up under the dashboard to the ODB2 outlet to see how it would look. I noticed that the product lit up displaying the voltage and the word Hud. Cool. It works! After spending about 30 minutes trying to translate the manual's very broken English and trying to work the settings controls (it's a 3 way switch - up, down, and in to navigate), I managed to get it configured for US measurements (MPH, F°) with two exceptions: the two over speed alarms and the fuel consumption information. Both of these are coded to only be in metric measurements (Km/H and Km/L, respectively) and you cannot change them. Since one of the variable displays is the fuel consumption information, I decided not to display this information. If you remember and understand that the values will be different than all the other measurements on the display, then you should be okay to display it. I personally elected to display the RPMs, voltage, temperature (in graph form only), and speed. This gave me information about the car, without it being overwhelming. One good feature that this device has is the automatic display mode (menu option #7). When set to zero, the device turns off all other display information except the speed when traveling more than 50MPH (80KMH). This is very helpful and practical and make it so that it's not so distracting. The unit has additional information to display, like the radiator temperature, mileage counter (i.e. trip computer), and alarms for when over revving the engine (i.e. you need to shift to a higher gear), over speed limit, engine fault, and fatigued driver. There is another "buzzer" alarm, but there's no menu setting to configure it. Maybe it's tied to the seatbelt, door open, or one of those types of alerts. Once I had it completely configured, I didn't want it just hanging over my dashboard, so I disassembled my dashboard and fed the wire up thru the console's pathways to tidy it up. I applied the adhesive pad to the dash and plugged in the HUD. This setup worked great. A quick note about how this looks. I always wear polarized sunglasses to get rid of the reflection of the dashboard and anything that is reflecting from it. This includes the HUD's box image. With the brightness of the HUD, this gives the perfect image of the information on the screen and, while the double image is there, it's not super annoying as long as I'm wearing polarized sunglasses. On sunny days, this HUD is tested to its limits and much of the colored information is washed away in the bright sunlight, but the speed is still noticeable, albeit faint. Other reviews of this same unit have recommended putting the reflection film on the windshield to allow the display to be seen better, but honestly, I have been hesitant to put anything more on the windshield which would create more of a distraction. However, if you've played video games, then the HUD shouldn't be a problem as the information is always present on the windshield and you don't have to look away from what's in front of you. From commuting to running errands to just general leisure, it worked. I was able to unplug it and take it out of the car to prevent dishonest people from obfuscating with it. That is until Monday morning when was about to head off to work. When I plugged it in after only 8 weeks of using it, each and every LED light on the display lit up and didn't show anything useful. I tried unplugging it and plugging it back in and even turned the car off and back on, but nothing helped. Basically, it died after only two months of use. After checking with Amazon customer service, I found out that the device has no kind of warranty at all, so if you buy one of these, be sure to get the extra warranty in case it craps out on you too. Pros: Easy to setup and start using Bright display Lots of information Automatic reduction of information at higher speeds to reduce distraction Various colors to differentiate different types of information Con: Doesn't include a non-stick pad for curved dashboards It's a little bulky The brightness can be a distraction if you are looking down at it while driving Lack of adjustment to US measurements on fuel consumption and speed alerts Settings controls are hard to manage and very touchy To make it look nice, you have to know how to disassemble your dashboard to run the wiring neatly Doesn't come with any stated warranty, so make sure you include one when you buy it

It is bright enough and the anti glare screen works - sometimes some of the read outs would not light up or indicate

I use this in a 2013 Hyundai Genesis Coupe . The dash and windshield are pretty curvy so I had to think outta the box to get the image to sit horizontal on the windshield (no stick on screen for me, unnecessary and screwy lookin IMO). Because of the windshield curve the unit needed to sit at an angle with right side elevated Fortunately I decided to mount it off-center left cuz I didn’t like the image continuously in my straight ahead view. I was able to fold the right side of the sticky pad under about 3/4 inch and impart a fold . Now the right side is elevated, and it lays against the curve of the dash for max sticky contact. Notice the close up pic and you’ll see the fold underneath on the right and the resulting angle Then notice the horizontal image in the other pic. So far it’s staying put just fine; I tucked the cord tightly to help provide marginally more structural support. This why the light weight of the unit is a plus. I recommend finding a video or 2 for setup;pic worth a thousand words and all that. It’s bright enough in 97.25% of the daylight and 100% of the night situations. Wish showed MPG instead of liters/hour and the other setting; useles to me as is so I shut it off. Which speaks to the customization abilities.Not bad at all really.

The directions made it seem pretty straight forward just a plug n' play install that even a child could do. Just wasn't my case. The directions were written with broken english and the confusing part was trying to install the reflecting/projecting film. I had not realized I was supposed to buy the HUD holder assistant mount (product sold separately and not mentioned when buying so you struggle when installing). Probably would have helped with the HUD sliding on the dash and other obstructive unsafe sporadic behaviors that come from this one. Though, when it turned on it was very bright and colorful and was impressed with picture being displayed on my windshield. That crisp, crystal clear, and vibrant picture that you see advertised by the product pictures and even the product box well you get nothing like, close to nor near it whatsoever. It was an impressively colorful pixelated eyesore of rubbish that I unplugged immediately. Wouldn't recommend at all to anyone now, tomorrow, or in the next century.