BUTTON WIRELESS MOUSE WITH SCROLL WHEELNX-7007 is a 3-button wireless mouse with scroll wheel. and has its button area lower slightly to make your finger comfortable while clicking, moving, or dragging the mouse cursor on the screen. The middle button is on the scroll wheel for fast browsing up/down, left/right on the Internet and in Windows documents.2.4GHz WIRELESS TECHNOLOGYThe 3-button 2.4G wireless mouse with USB receiver works for notebook and PC. Plug & Play no driver need.BLUEEYE SENSOR TECHNOLOGYEnjoy the greatest benefit of BlueEye sensor technology to use NX-7007 on marble, sofa surface, dusted glass or carpet.2.4GHz wireless technology3-button with scroll wheelPlug and play USB pico receiverContoured shape great for either handPower switch extends battery life