Product DescriptionThe Lenovo Essential Compact Wireless Mouse, designed with your convenience in mind. It’s easy to get more done when you don’t have to waste time untangling messy cables or searching the office for new batteries. Its compact size makes it the perfect companion no matter what the occasion. Slide it into your pocket, backpack or laptop bag, and you’re ready to go.Top FeaturesCompact and portable designOptical sensor with 1000 DPI resolution1 AA battery for up 12 months use (may vary based on usage)Part Number: 4Y50R20864