The MK540 Advanced keyboard and mouse combo is designed for precision, comfort and reliability, providing an instantly familiar user experience. The full-size keyboard features keys with a familiar shape, size and texture—and the curved, ambidextrous mouse is designed to comfortably fit the palm of any hand. Logitech MK540 Advanced Wireless Keyboard and Mouse Logitech MK540 Advanced is a wireless keyboard and mouse combo designed for precision, comfort and reliability. The tiny USB receiver features Logitech Unifying technology. The keyboard is spill-resistant (1) and the wear-resistant keystrokes ensure that the keys won't fade quickly. The palm rest and adjustable, fold-out feet allow for comfortable working even on long days at the desk. The keyboard features convenient hotkeys for direct access and preset function keys that can be personalized in Logitech Options. The mouse fits both right and left hand and offers advanced tracking technology and precise cursor control. Keyboard Product Details: Dimensions: 193.5 x 457.3 x 24 mm Weight: 805 g Adjustable keyboard height: 3 tilt positions Special keys: Music control, programmable keys 10-key number pad Palm rest Key type: Deep profile Caps lock indicator light On/off switch 2 AAA batteries?Alkaline battery? Battery life: 36 months Mouse Product Details: Dimensions: 61.8 x 39.2 x 11.5 mm Weight: 73.5 g Sensor technology: Advanced Optical Tracking Number of buttons: 3 (left/right click, middle click) Scrolling: Line by line Scroll wheel: 2D, optical Connection/Power: On/Off switch 1 AA battery?Alkaline battery? Battery life: 18 months Wireless range: Up to 10 m (2) Compatible with Windows 7, 8, 10 or higher, ChromeOS Tested under limited conditions (maximum 60 ml of liquid). Do not immerse the keyboard in liquid. Wireless range varies depending on usage, environment and computer conditions. Battery life of the keyboard and mouse varies depending on usage and environment.