Microsoft didn't just limit its latest hardware introductions to the Surface Laptop -- there's a new (if familiar) mouse as well. The Surface Arc Mouse is an evolution of the well-established Arc Touch Mouse that takes advantage of several years of progress. Most notably, it's what you don't see that matters. The new Bluetooth peripheral still has that eye-catching, travel-friendly design that snaps flat for stowing in your bag, but there are no distinct left and right buttons, or even a scroll strip. Instead, a monolithic touch-sensitive button handles all those functions.