Product Description Off-table design for free and comfortable operation. Ideal for laptop users. Thumb-controlled trackball. Ideal for presentation. Product Features Off table and without limitation of operational space 4D page scrolling function can be controlled simply by your thumb Can avoid the harm on your wrist and muscle Fit left and right handed users Product Specifications Plug and play no software required USB Black Color Unit Dimensions: 5.75x2.5x4.25 inches Why Buy From Extreme Computing.com? We're a Yahoo Top Rated Merchant - 5 Stars! 100% satisfaction or full refund. Friendly, personal service, always! Secure ordering through Yahoo store. In business on the web since 1997 95% of orders ship within 24 hours. Free stuff with every order. Customers Rave: "Excellent! This is my second purchase with Extreme Computing. They are very efficient and send little extras that make it seem like Christmas!" - Robert M. "This company has the best price for what I needed and it arrived safely in 2 or 3 days...I will shop with them anytime they have what I need...Thank you Extreme Computing!!!" - Della C. "I think they are great!!! I had asked for additional info on compatability. Their answer was very complete and helpful. They ship when they say they will and follow up with confirmations and tracking numbers automatically. It is also apparent that their employees are proud of their company and their positve attitude shines through in their correspondence and in the the way their web site is written. The people I gave the gifts to actually said I shouldnt have gone through all that. If they only knew how easy it was." - Carolyn M. [See more.] Copyright © 1997-2010 ExtremeComputing.com. All rights reserved.