Microsoft Wireless Desktop 850 with AES (PY9-00001) Advanced Encryption Standard (AES) 128-Bit Encryption 2.4 GHz wireless delivers a reliable connection with up to a 15-foot range Windows shortcut keys provide easy access to commonly used functions Media keys for music and video control Design is suitable for use with either hand Optical Technology 1000 dpi provides responsive cursor control Snap-in transceiver stows conveniently under the mouse