This is the worst mouse for reliability that I've ever seen. Two of these purchased for the obvious ergonomic reasons. They come with internal lithium rechargeable batteries which is nice, and the mouse seems to track well.

This mouse gets 1 start because of it's historic poor quality receiver dongle. I've seen two of these go down for no apparent reason. No matter what you do, there is no recovering them once they stop working. A 170 dollar wholesale priced mouse should be more reliable and rival ANY other mouse for quality. If you buy one of these, you will like at it at first, but live to regret it. ME was wicked smart making these a special order.

But it and you'll regret it. There are other devices out there that are far less expensive and provide the same type of ergonomic suppport.