I brought this recently, about 2 weeks now and I LOVE it. It was easy to install, a battery was supplied, you can turn it off and on. I love the feel of it in my hand and the ease of using it. I don't know HOW and WHY I have not purchased sooner. Thank you HP! I have a HP ENVY and this is a perfect accessory for it.
Although advised by HP that this mouse could replace the mouse supplied with the HP computer, it did not work as described. The only way I could make it work is by using two receivers, one for the mouse and one for the keyboard.