I've been using it for a few hours. For 3.50 euros, it's just fine. Its signal is exactly the same as a Logitech keyboard I have. They lose connection at the same points. Regarding the fact that it doesn't have an on/off switch, I noticed that if you leave it still for 10-15 minutes, it turns off by itself, and you just press a key to turn it back on. Of course, it's not the best mouse, but let's not go crazy; it's 3.50 euros. If a store near you sells it, get it; I don't think it's worth anyone paying double just for shipping.

Not at all satisfied!
- The battery door broke on the first try, it has a very thin and sensitive point at its lock.
- I tried it on a black mousepad, and it didn't register the movement at all.
- On a white mousepad it works, but it delays in registering movement commands. I moved my hand and it picks it up after a few seconds.
- There is no button to turn it off.

That's it, stay away, spend a little more and get something better.