The tiny Logitech Unifying receiver is small enough to stay in your laptop and connect whenever you need it. Plus, you can easily add another compatible mouse, keyboard or number padwithout the hassle of multiple USB receivers. Logitech® Advanced 2.4 GHz wireless connectivity gives you the reliability of a cord from up to 10 metres (30 feet) away. Auto-frequency switching means you'll enjoy virtually no signal losseven in the busiest wireless environments. And it helps keep your information secure with 128-bit AES keyboard encryption, one of the highest levels of security available. A 24-month battery life means you can go for years without the hassle of changing batteries. And there's no need for On/Off buttonsauto standby saves energy for you. The things you do most are right at your fingertips with eight hot keys for instant access to the Internet, e-mail, play/pause, volume and more. Setup couldn't be easieryou simply plug the wireless receiver into a USB port on your desktop,