ACECAR Digital GPS Speedometer New HUD Car Head Up Display LCD Display with MPH Digital Speed Compass Direction Driving Distance Altitude Overspeed Alert for All Vehicle

Easy install and works great. I used it on one of my classic cars that has a KPH speedo

I'm sure it works great... In China, which is where I'd like to send it back to. Yes, I read the tiny instruction manual. Yes, I understood it. Yes, I set it to my local time. I left it in the open. I left it powered on for days. I drove it with open skies. I did not deviate from the required voltage of 5 volts. (It is apparently "Forbidden" to run it any other way) No, it has no idea where it is, what direction it is going or how fast it is going. If I did it wrong, its because the directions are inadequate. Otherwise, it is simply defective. IDK if there are a thousand 5 star bot generated reviews. Its JUNK.

First off, reviews complaining about accuracy... you guys are lame. It will allow you to calibrate if you notice a discrepancy between you phone's GPS & the unit's. You will notice it is slower to respond than a real, non-GPS gauge. Keep in mind GPS technology is accurate to about 3 feet so that's why it'll slowly tick down when you come to a stop, for example. Or if you're clocking 0-60, this isn't the unit for you. Go buy a real automotive wired gauge. If you want to know your cruising speed so as not to get a speeding tticket, this should do! One thing that may also effect accuracy is the proximity to windshield. You'll want a clear view to the sky/satellites! This is a great unit if your gauge went out and you don't feel like dumping hundreds of dollars into repairing the factory equipment (like me!) Next, it's USB powered, NOT rechargeable. Again, not a big deal. Just take a little time to route your cable nicely. The unit must have some type of memory as it remembers your settings when powered off/on. Settings seemed a little confusing, at first, but once you figure out it's super easy. All Settings with one nice button: HOLD button in to open each mode (1-8, think it was) then toggle button left or right to change setting. Pretty cool. Great selection of LED colors, too! I matched to the gauge cluster but many more.

Awesome and affordable little gadget. It has to be plugged in to work but that’s fine for me. I have tall handle bars on my motorcycle and looking down to check the gauges takes my eyes off the road longer than I’d like. This thing locks right up and is accurate. I was worried it might fall off on the road but it has held up at freeway speeds just fine so far 👍

Ok, not great. The horizontal segments aren't as bright as the vertical. Also the highest brightness setting wasn't all that bright.

It's very nice, but I am having trouble reading the VERY small print on the directions. ..also having trouble keeping it to mph. .. wants to stay on km.. maybe if the instructions weren't so small...otherwise the style is sweet and I like the different colors it offers...

Very good. Very useful for analogic velocimeters.

Truly garbage. The screen is great, it was easy to set up, the mount is great...... But it doesn't work well if at all. It takes at least 20 minutes to find a satalight and then it works sporadically about 5 mph fast. It then gets stuck at a random speed. Wildly unhelpful.