An additional left-side button operates with either your thumb or, for left-handed mousers, the third or fourth fingers. The Arc Mouse has a classic three-button setup for the left and right buttons, plus a ratchet scroll wheel that also acts as a button. It has a matte plastic shell that I found especially agreeable, smooth but not slippery my hand felt secure around it and holding the mouse took no effort. It’s just the right size for my smallish hand-but I can imagine that people with smaller or larger hands will also be comfortable using it. This mouse is lightweight, with a spare body, and it comes in black or red. Then there’s the Arc Mouse, so named for its shape when fully extended into its operational position. Others are low and smooth, so slight as to be almost nonexistent. Mice come in all shapes and sizes-some are clunky, ergonomic beasts that seem to have a nook and cranny tailor-made for every part of your hand.
