Kensington Ci85m QuickStart Wireless Notebook Mouse in Green and Silver K72287US Up to 30% thinner than a standard notebook mouse--eliminates bulk from your travel bag Back up power for wireless or USB powered operation Automatic sleep state conserves power and protects the optical sensor Sleek ergonomic design provides comfort and mobility Instant set up--just turn on your notebook, extend the antenna and go (ExpressCard slot required)