LM-3150 Wireless Optical USB Mouse, New in Retail Pack. Product Features: Ergonomic design Comfort to fingers in mouse movement USB Interface Support Windows95,98,2000/NT/XP/Vista. Opticcal Sensitive with 800DPI. Easy to Install. Just Plug&Play. Middle Buttonfree Scrolling for Windows 95,98,2000/NT/XP XSLM3150 In Stock Sales Assistance: 800-832-5168 (9:30-6 Pacific, M-F) Phone-Orders and Will-Calls are welcome! Call us before you arrive in-store! Holiday Dec.24 & 31 Office are closed. For UPS Holiday delivery schedule, visit http://compass.ups.com/ All items carry a 14-day money back guarantee (15% re-stocking and without shipping charge) For OPENED Software Package with manufacturer guarantee, the customer should contact the manufacturer directly for service or exchange If "Shipping Charge" shown on your order is less than $4, you must please call or e-mail us to confirm the correct "Shipping Charge" All trademarks, registered trademarks, and names are the property of their respective owners.