Optical 2400 DPI Grey Bluetooth Scroll type: Ball Buttons quantity: 3 Power source: Batteries AA OverviewThe Lenovo 600 Bluetooth Silent Mouse takes a well-worn concept and turns it on its head, delivering a productivity device that doesnt get in the way of the busy individuals who use it. It is sculpted to be comfortable to rest your palm on, with a low-profile, minimalist design that makes the mouse easy to carry and fit into pockets without bulging. Get more done with the blue optical sensor that allows you to work on most surfaces, revolutionary, distraction-free silent buttons, and on-the-fly adjustable DPI controls. Effortlessly pair with up to two devices at once and quickly switch between them with the push of a button, thanks to Bluetooth 5.0 and Microsoft Swift Pair technology. Mouse Certification ANATEL, ANRT, ARTCI, BSMI, CB, CE-RED-EMC+RF, CERT, cTUVus, DWLF&M, EN62471, ENACOM, FCC ID, IC, ictQATAR, IMDA, JRF, KC, MIC, NCC, SRRC, SUBTEL, TRA, TRA, TRC, TUV Mark, UCC, WPC