FULL-SIZE FUNCTIONALITY - Have the functionality of a full-size keyboard without sacrificing form or function. The MK520 includes a stylish and streamlined keyboard and ambidextrous mouse PRECISION MOUSE WORKS IN EITHER HAND? The M310 wireless mouse features soft rubber grips and can be used in either hand. It provides the precision needed for fine applications LONG BATTERY LIFE - Tired of short battery life? The MK520 package boasts significant battery run time. Using 3 regular batteries, the keyboard will last for up to 3 years, and the mouse for up to 18 months SIMPLE SETUP - Simply plug the Logitech Unifying receiver into your computer and you’re ready to work-nothing else is needed ENCRYPTED CONNECTION - Enjoy the flexibility of working wirelessly with an encrypted connection. The MK520 utilizes 128-bit AES encryption and a 2.4GHz signal to keep your connection fast and secure