The mouse is a large egg-ish shape, with three buttons and a scroll wheel on the right side, and a large indent for your thumb on the left. The top button left clicks, the bottom button right clicks.

You can switch mouse buttons – left to right in a few simple steps. Switch Left and Right mouse buttons to make the Mouse Left-Handed By default, a mouse device is configured to be right-handed ...

Logitech is flipping the design of the computer mouse ... buttons as well. Logitech lets you have this same level of possibilities for the forward and backward buttons on the left-hand side.