Dell Pro Wireless Keyboard and Mouse KM5221W, US International (QWERTY), Wireless, 2.4 GHz, Mouse Buttons: 3 (Middle click is programmable), Mouse Resolution (DPI) : 1600, Mouse Weight: 65g, Keyboard Multimedia Keys:3 Multimedia Keys ( Vol+, Vol-, Speaker Mute), Keyboard Weight: 400 g, Keyboard Typing Mechanism: Plunger keys, Hot Keys Function: 12 programmable keys of F1-F12, Colour: black, 3 years NBD Advance Exchange