The most striking aspect of the Targus Bluetooth Laser Mouse is the small dime-sized round optical sensor that sits between the two mouse buttons in place of a traditional scroll wheel. Targus calls the concept "four-way touch scroll," and its functionality is similar to that of a trackball. The scroll zone is very sensitive, which makes scrolling up and down long Web pages a snap, but makes precision scrolling nearly impossible.
Since the optical sensor has no moving parts, the lack of any tactile feedback under your finger makes it hard to, for example, scroll up or down just a line of two in a document. Still, it's an intriguing idea, and with practice, becomes easier to use. It also works well for zipping through wide spreadsheets.
Targus also makes a non-Bluetooth version of this mouse, which includes a small USB dongle tucked inside the battery compartment.
