Hi I bought the mouse recently and am very happy with it. It is very well made and is very comfortable to hold. It requires 2 AA batteries and thus goes around also very economical. I have the device hitherto one month in operation (several hours each day) and as yet no signs of a battery change. I have already put a review on Youtube online [...]. I am definitely very satisfied with the device. The mouse is also ideal for gaming, since it operates at 1600 DPI.