Thank you for viewing my Auction Site. Please read item description and view the pictures very carefully before considering purchase. For your consideration, I am offering one authentic Logitech WIRELESS Ergonomic Trackball Mouse. COLOR: GRAY. MODEL: M570. NOTE: The auction does not include the Wireless USB Receiver and will either have to be purchased separately or employ your own. The Mouse was recently bench tested with my very own personal USB Receiver and everything worked perfectly. The Trackball Mouse was manufactured in China. The Mouse unit is the actual (OEM) product from the manufacturer not a cheap knockoff and not refurbished previously. I am selling the WIRELESS Trackball Mouse (without the USB receiver) as in Like New (USED) cosmetic condition with no previous defects found looks lightly used previously. I found the unit by its self in a box of items I purchased at an Estate Sale and is very clean. I have no want, need or desire to retain this item. I figure someone must need this high quality Mouse either as a replacement or as an extra. The Mouse casing is made of durable plastic. There is no previous signs of damage to the outer plastic casing such as any, cracks, holes, deep scratches, scuffs, broken or missing pieces, color fade or signs of heavy oxidation. NOTE: The bottom side of the Mouse may show (IF ANY) minimal to light wear and tear. The Battery Box and plastic Cover piece shows no previous signs of battery acid leakage damage of heavy wear and tear. The plastic Cover piece will stay affixed. All buttons and Scroller Ball were recently bench tested by me and all will perform perfectly. The description and condition of the mouse is fully GUARANTEED. The item comes from a Smoke FREE Environment. I am offering Fast FREE Shipping. The Logitech WIRELESS Ergonomic Trackball Mouse without USB Receiver shown in the pictures will be the actual item received. Please feel free e-mail me if you have any questions. Thank You for LQQking!