With a few key design tweaks, Logitech has created a sensible living-room computing accessory with its Couch Mouse M515. The sealed-in sensor will remain free of obstructing dirt and hair, and grip detection technology provides insurance against unintended clicks. For $50, the M515 might feel like a luxury product compared with more affordable wireless mice, but it's also a less expensive option than some higher-end media mice. We recommend it to living-room-computing enthusiasts who don't already have a reliable input device.
The Couch Mouse M515 is smaller than a standard desktop mouse, but a little larger than a typical laptop mouse. That's probably a wise design decision by Logitech, in that a full-size mouse could feel cumbersome in the living room, but a smaller design might be easily lost.
A wireless mouse, the Couch Mouse M515 is also a member of Logitech's Unified Device family, which lets you use multiple devices from a single Micro-USB wireless receiver. Logitech offers a number of Unified keyboards that could also work on the same adapter used by the Couch Mouse, but none of them are small enough to qualify as living-room keyboards. Even if there are no obvious other products that would accompany the Couch Mouse and its Unified receiver, you will likely appreciate that the receiver is so small that it essentially disappears into most USB ports.
The hallmark feature of the Couch Mouse lies in its underside. Unlike most mice that use an optical sensor to track your movement, the Couch Mouse has no hole for the sensor to shine through. Instead, the plastic covers the sensor to keep out dust, pet hair, crumbs, and other living-room detritus that can become lodged inside the mouse and disrupt the sensor's accuracy.