Excerpt: Big mouse, cute gimmick—the cord retracts into the body of the Kensington PocketMouse Pro ($40 street) with the press of a button. The cord winder increases the mouse length to 4 inches. And although the cord is thin, it holds its form when rolled up and stored, so moving the mouse freely is difficult. The cord doesn't get tangled up in your bag, but the mouse has noisy buttons and connects only to USB.
Conclusion: But while the retractable cord is cool, it disappointed us when we tried to use the PocketMouse Pro with our desktop PC, too -- as you might want to, if you're tempted to spend the $40 both for traveling convenience and to replace an old rolling-ball mouse in your office. Pulled all the way out, the tether is only 28 inches, compared to about six feet for most mouse cords -- too short to reach from most desktop systems to their mouse pads.
Pros: Ingenious retractable-cord gimmick works like a charm, Smooth operation; slick button-customization software
Cons: You'll want to use it with your desktop, too -- but the cord's too short, A bit bulky for the tightest coach-class environments
Conclusion: We love the convenience of the small yet comfortable Kensington PocketMouse Optical Micro Wireless, which works wirelessly via an RF connection, then stores the USB RF receiver inside the mouse's case when not in use. Storing the receiver automatically shuts the mouse down to save on battery life.
Pros: Works wirelessly with RF receiver. The receiver tucks inside the mouse when not in use, automatically turning the mouse off. Comfortable wide body. Mouse turns off after a few minutes of inactivity. Powered by two included triple-A batteries.
Cons: No way to tell when batteries are running low.