I am satisfied
When it arrived I was a bit surprised by its size 11cm x 8.2cm, you will need a support to put the anemometer correctly so that it gives measurements consistent with reality, do not place it in a corner or near a wall, the ideal is to fix it on a pole or on the support of a TV antenna / satellite dish.
On the other hand I do not trust the resistance of the plastic to the sun (up to 37° some days), especially as it is mostly black, I placed it for my part below my dish so that it is partly in the shadow of it.
It indicates the wind speed and direction as indicated in the description, and the batteries are supplied with the device.