The Combimouse is one of those Indiegogo projects, which means it needs your funding to make it real. Now, what you are seeing in the photo is what the Combimouse looked like a few years ago.
You can watch a video the Combimouse on the Indiegogo site here to see some idea of what it will look like when it gets its funding. The concept remains the same as the right side can become a mouse and function as a keyboard as well.
You will have to move the hand off the keyboard to operate the mouse, but this is a very interesting method of input. If you want to help make this a reality, go ahead be prepared to help in the $20,000 the creators are seeking to bring it to the market.