Professional 2.4GHz Wireless USB 2.0 Optical Mouse (1*AA)

Works with just one AA battery, that is very easy to find.
It have an CPI button, used to change the sensitivity.
I tested with 3 meters and works perfectly(exist a wall, so i could not go far away from that)
Have an ON/OFF button bellow, so if you don't need use, you don't need to take the batteries life.
After some twenty minutes without use, it automatically turn off and you need to click it to back to work, it's very nice to don't use the battery life if you forgott to torn it off
I use this mouse to my notebook and I've a Genuine Microsft Wireless Mouse and Keyboard 2000 on my computer. Both work perfectly without any interference.