This video tutorial will illustrate the function of the new trackpad. It will show you where to locate the buttons, 3.5mm headset jack, micro USB port, convenience keys, play/pause/mute, standby mode, track forward and track backward of the BlackBerry® Curve™ 8520 smartphone.
Source:
http://www.youtube.com/watch?v=80cuECGl-wE&feature=player_embedded