Top trackball

This trackball is the best and in my opinion the only one who really is any good. I had previously had been the corded version in daily use, this now has a problem to me the left click button. No wonder I edit min. 8 hours daily Excel tables. After about 3 years, I would at the same time probably requires at least 2 mice. At first I had concerns that the cordless variant possibly has problems with the reaction etc. That's not the case: The battery lasts a long time, the reaction time is not measurable, or not available. After restarting, the trackball can be used immediately. The USB unit of the PC is tiny and does not interfere when the laptop is in the bag. The installation takes less than 20 seconds. and already works everything (Win 7). I would highly recommend this trackball clear!