Unfortunately, it does not work for me even though I have installed the batteries correctly, the display turns on but it does not record the speed in kilometers

I just received the speedometer. Different packaging from the original + second time I'm getting it) it rattled inside like a rattle and the part that goes on the fork is missing. And the store doesn't answer the phone. Tragic situations. P.S. in the meantime, the speedometer is dead, it doesn't even turn on.

It does its job. If the fork has distance from the spokes, it may require a little more effort in placement, in order to have the required distance from the magnet.

So far everything seems fine to me regarding its operation.. One negative thing I would say is that it does not have user instructions. So, YouTube for setting up and placing it.

The indications look fine
The screen lighting is good
It turns off automatically.
It does not turn on automatically, you have to press the central button, I do not consider it a disadvantage, I will ask other users about it.!!!
In the description it says it is waterproof, I have not tried it in the rain.
Attention, there is the same but wired (with cable) so before ordering ask the store.

After using it for a considerable period of time, it works flawlessly. It requires some attention in placing the sensor and the magnet close enough to each other and changing the battery when there are delays in transmitting the measurements.

Awesome tool for the bicycle
everything is very nice
the letters appear crystal clear, waterproof, and with a good tightening it withstands even the toughest routes
I highly recommend it!!!