Patented 4D Off-Table Hand Track with USB Interface Black body with Green ball The "Track Mouse" is a brand-new input device. It is off-table, without limitation by operation space and avoiding harm to wrist and muscle. The two dimentions and buttons are simply controlled by fingers. Features Elegant design, no surface needed Single ball, high speed optical 4D scroll inside Off-table makes it ideal for free and comfortable operation 4D page scrolling function can be controlled simply by thumb The harm of radiation and eye fatigue owing to using a traditional mouse can be reduced Compatible with Windows 95 ver.B/98/2000/ME/XP USB Interface, Plug-and-Play Patented and pending in EPC, JAP, PRC, ROC, USA and other countries Target users: Notebook PC users and long-time PC operators One-year limited warranty /Retail package Availability: Usually ships the same business day 3G-Green 4D Scroll Trackball Finger Mouse (USB) - Black FDM-G51Regular price: $19.99Sale price: $9.95 Secure On-Line Ordering Site Tel: (888) 860-4416 Fax: (732) 416-8788 sales@pctekonline.com Business hours are from 10:30am to 7:00pm EST Monday to Friday 3 Kellogg Court Suite 11 Edison NJ 08817 Copyright (C) 1997-2011, PCTekOnline.com All rights reserved. Thank you for shopping at PCTekOnline.com !