Battery powered Batteries Mouse ambidextrous Ambidextrous HP X4000, Ambidextrous, Laser, RF Wireless HP X4000. Form factor: Ambidextrous. Movement detection technology: Laser, Device interface: RF Wireless, Buttons quantity: 3, Scroll type: Wheel. Power source: Batteries http://www.digitalversus.com/computer-mouse/hp-wireless-mouse-x4000-p13359/test.html The Wireless Mouse X4000 is HP's latest laser sensor mouse, sold at an affordable price, and as such has earned a place in our reviews. HP Wireless Mouse X4000 Here's... No setup required; just plug it in, For both righties and lefties, Adequate for basic tasks (Internet, editing documents...), Softtouch body, Smooth movement Useless for games that require speed, Few buttons, Instep scrolling only The X4000 is fine for basic office work. It's inexpensive and glides easily over the table. But it may disappoint users who want something more out of their mouse, because it has only two buttons and its maximum speed is far too low for video gaming....