I think it does its job very well. I use it in a Yaris 2005 because it doesn't have a temperature indicator!

I have had it for several years in an Opel Corsa D CDI connected to the brain's socket, water temperature, speedometer, tachometer, consumption, turbo, indicator shutdown, etc. ... It was connected by an auto electrician and works perfectly fine ...

Installed in an Opel Corsa D 2007 1200cc. I put it in for checking the water temperature. According to the car's hidden menu, the various temperatures were just 1 degree apart. Detailed indications-malfunctions:
Positives: Water temperature, tachometer, speed, battery volt, clearing faults (Check).
Negatives: Does not show oil temperature, consumption, and all the rest. The glue on the base is not sufficient; use another double-sided tape.
Every now and then, at least once a month, I had to unplug the cable from the back because it would get stuck and wouldn't turn on.

I got 2 as one broke due to my own mistake. The first needed to be opened from the button every time I started the car while the 2nd opens automatically. However, neither of them measures the oil temperature correctly, which is the reason I got them. 1 star barely, only for the appearance

For the money it costs and what it offers in terms of features, it is very good; I still don't know if it is 100% accurate, but it's better than not knowing anything at all

I've had it for about 5 years, I can't say that the indications for water temperature, oil, etc. are accurate but they're close enough, it doesn't even read the brain (Volvo XC60 2012), not to mention that a couple of times it short-circuited the gauge momentarily and the lights turned on by themselves. You get what you pay for, of course.

Placed in an Opel Corsa D 2007 because it doesn't have a temperature gauge. Deviation from the car's temperature was 1 degree higher (compared to the hidden menu of the car that shows the actual temperature). The fuel consumption was incorrect. Kilometers, water temperature - oil temperature, speed limits, and voltage, which are the basics, were okay. Sometimes it wouldn't turn on and you had to disconnect the cable for it to work again. I would buy it again only for the temperature.

Connected quickly to the car, sometimes it created communication problems (the counter did not work correctly and displayed various faults).
Suddenly one day the screen just fell!
Attention, it does not fit all vehicles, check compatibility!
Also, in my car (Alfa Romeo Giulietta), it displays completely wrong indications!

I bought it mainly to measure the oil temperature since my car doesn't have a corresponding needle indicator. With a cold car, it reads an oil temperature of 110 C. Complete disappointment, Chinese, and 50 Euros is not a small amount.

I bought it for €49.34 on May 23rd, and the Water Temperature, for example, shows 90C, suddenly drops to 40, and in 1 second it goes back to 90C. It goes to extremes with the corresponding sound signal!! Whether it is broken or needs a firmware update. I will contact the company. It fits for a 2012 KIA Venga. I DO NOT RECOMMEND it, it's a waste of money. The same issue also occurs with the engine RPM indicators.

I tried it on my own car, Octavia 2002
Golf 4 2001
which is obd 2 and they do not connect.

Unfortunately, it does not work on a 2015 Toyota Aygo mk2. It does not connect (protocol failure). It works on an Opel Meriva 2004.

It does what it promises. It solved my temperature issue because my car doesn't have a temperature gauge.

Very good, easy to install, easy to adjust, and works perfectly. I have been using it for the temperature and that's why I bought it. I highly recommend it!

I have it for 2 months, daily use and permanently connected.
It does exactly what it says and with accuracy.. It requires proper placement for the proper functioning of the light sensor.
With proper setting of the alarms, it can save you from serious damages.
I recommend it!

Variety of indicators with a small delay but cheap construction materials for its price. The screen is very small and the lighting during the day is insufficient to non-existent.

In the first use, the car had some malfunctions and I immediately returned it. I was worried it might cause some damage to the brain. But from the next day, it works perfectly. The button is not very sturdy and it seems like if I use it frequently, it will break. As for the temperature indicator, which I want, it seems very good so far.

Flawless! It does exactly what it says.. Read the instructions and vehicle compatibility

Incredible for its price. It does everything and it's worth it. I have it permanently in the engine temperature to keep my mind at ease. Someone mentioned that the indications are not in the metric system. It changes in the settings and displays kilometers per hour and degrees Celsius. Don't condemn a product before you see it. Honest and reliable

Nice little device, it has many functions but unfortunately the water temperature is too high and its placement is easy. Because the temperature is too high, two stars.