Crafted for optimum comfort and response, the Logitech MX Master Wireless Darkfield Mouse offers comfortable and precise control. Hand-sculpted The ergonomic design supports your hand and wrist in a comfortable, natural position for optimum comfort during use.A Darkfield laser sensor delivers accurate tracking on virtually any surface, including glass and high-gloss surfaces. Adaptive scrolling With the speed-adaptive scroll wheel you'll be able to scroll through long documents and web pages quicker and easier.The thumb wheel enables side-to-side scrolling with just a stroke of your thumb. The actions of the scroll wheels and buttons are fully customisable to suit you thanks to the downloadable Logitech Options software. Wireless connectivity This wireless mouse uses dual connectivity for optimum performance - connect to your PC or Mac via the included Logitech Unifying Receiver or via Bluetooth Smart technology. You can pair up to three devices and easily switch between them at the touch of a button. Free from trailing cables, the MX Master offers excellent versatility, ideal for use in the home or office. Recharging quickly, this wireless mouse provides up to 40 days of power from a full charge. Enhance your everyday computing with the Logitech MX Master Wireless Darkfield Mouse.