Logitech MK540 Advanced Wireless Keyboard and Mouse Combo - Keyboard: 36-month keyboard battery life (2 x AA batteries pre-installed), Advanced 2.4GHz wireless (10 meters), Tiny USB receiver with Logitech Unifying Technology - Mouse: 18-month mouse battery life (1 x AA battery pre-installed), Full-size and ambidextrous, Advanced optical tracking - 920-008682 - 12 Months Limited Warranty