Thank you for viewing. This is a listing for the "Logitech Wireless Mouse Trackball M575SPd." I bought it because I was interested in trackballs, but it was too big for my hand, so I am listing it without using it much. It's a very popular trackball, so I think you can purchase it with confidence. Logitech Model Number: M575SPd Main Color: Black I have only purchased it and confirmed that it works. Batteries are not included. #Smartphone/Cameras #PC/Tablets