Logitech Performance MX Wireless Mouse with Darkfield laser tracking technology. The bottom label clearly identifies this as the Logitech Performance MX, model M/K-5, featuring Darkfield high-precision laser tracking that works on virtually any surface including glass.This is Logitech's flagship ergonomic wireless mouse designed for power users and professionals. The Performance MX features a full-size right-handed ergonomic design with a comfortable thumb rest, hyper-fast scroll wheel with click-to-click and free-spinning modes, DPI shift button for on-the-fly sensitivity adjustment, back/forward navigation buttons, zoom buttons, and an application switcher button. The mouse uses Logitech's Unifying receiver (2.4GHz wireless) for a reliable lag-free connection.Key Features:- Darkfield laser sensor works on virtually any surface- Hyper-fast scroll wheel with dual-mode scrolling- Multiple programmable buttons- Ergonomic right-handed design- Wireless 2.4GHz via Unifying receiver- ON/OFF power switch on bottomCondition: Used. Shows normal signs of use including light wear on the rubber thumb rest area and some dust/minor marks on the body. Functionally tested. Please note the Unifying USB receiver is not pictured — verify if included before purchase.What's Included: Mouse only (receiver not confirmed in photos).Ships fast and securely packaged.