This Left Click icon is a responsive icon. This means that it's optimized for four resolutions, from tiny 16x16 until highly detailed 80x80. The style comes from the latest Microsoft Office, which makes it perfect for any Windows applications, in particular, those with ribbon toolbar control. Unlike other icon packs that have merely hundreds of icons, this monster icon pack contains 15,500 icons, all in the same style and quality.
It's a computer mouse. The clicker on the left side of the mouse has been shaded with dots, and extending from the direction of the left clicker are two waves. The waves get bigger the further they go outward.