Adesso ATP-400UB - Browser Cat, 2 Button USB Touchpad for PC and Mac Small and portable. Thin and comfortable design. One-touch scroll. Double-tap and hold your finger on the pad, or hold the left button as your finger glides to grab, drag, and highlight any item on-screen. Quickly activate vertical scrolling by gliding a finger along the touchpad edge. Edge-extending features make it easy to keep moving the cursor after you've run into the touchpad's edge.