The Targus W571 is a cheap wireless mouse when comparing to the Microsoft and Logitech Brand. The built quality of this mouse is excellent. it is small, accurate and durable. I am using this mouse for one year now. till now I have never faced any issues. The battery backup is also good. it lasts for one month on daily 2 hours average usage. Previously I was using Logitech M235. I think it is better than that.