You'll appreciate how Microsoft Wireless Mobile Mouse 1000 comfortably fits your mobile lifestyle and your pocketbook. Whether you're sending email or presenting to a class, you can rely on precise optical tracking to scroll, point and click smoothly. Plus, roam up to 30 feet away and retain reliable wireless control of your computer. When it's time to pack up and go, you'll hardly notice the tiny transceiver. Leave it plugged into your computer's USB port, or tuck it into the bottom of the mouse for travel. Keep using the mouse for up to 10 months without having to change the batteries and save power with the convenient on/off switch.