Summary: I have tried lots of wireless mouses, I maybe unlucky but sooner or later the plug in widget conks out (technical term) after a while even if you pay £30. So back to a wired one for me. Well this does the trick. It works, it's robust, I just chuck it in my bag and off I go (hiho, hiho). It glides well and is precise. Best of all it was £4! So even if I break it in a few weeks I'll just get another one.