The latest mouse in Logitech's seemingly endless line of input devices is the Wireless Mouse M505, a $50 portable pointer with an attractive design that comes in three colors: black, gray, and red. It's also one of the first devices to feature Logitech's Unifying technology, which allows you to connect up to six devices including keyboards and other mice to the same mini-USB transceiver. The technology promises to free up USB ports for other devices, but it also means that you're marrying into the Logitech family. The mouse is accurate and comfortable, but for $50, we're disappointed by the lack of thumb buttons. If you're looking for a no-fuss wireless mouse to throw into a laptop bag and run, we'd recommend the Microsoft Wireless Mobile Mouse 4000, which offers many of the same features and more for $10 less.
The Logitech M505 is similar in size and shape to the Microsoft Wireless Mobile Mouse 4000. It fits comfortably in both hands and there are slotted grooves in the clicker area for the ring and pointer fingers. The scroll wheel in the center of the two buttons is notched (as opposed to smooth), which allows for more precise scrolling through a longer Web page or document. The wheel is clickable as well, bumping the total up to three buttons. Unlike the Microsoft 4000, however, the mouse is missing the thumb buttons that we've grown accustomed to using as a shortcut for the "back" button in our Web browser.
Underneath the mouse, you'll find the laser tracking unit, an on/off switch to preserve battery life in transit, and a release for the battery cover on top of the palm rest. The laser performed well in our accuracy tests, but we prefer the Microsoft 4000's BlueTrack technology that lets you ditch the pad and mouse on most surfaces that a laser just can't handle, including carpets and other rough and reflective textures.
The mouse runs on two AA batteries that are included in the package; it doesn't support rechargeable batteries, but Logitech tells us that the two alkalines will power the mouse for 15 months with help from the "smart sleep" mode that automatically switches to consume less power during long periods of non-use.