Hope this will help.
Basically this is an F1 racing concept.You upshift with one and down shift with other...
Have you ever ride a motor bike...its kinda of it but much more simpler and easier...
Look this as well
Ways of changing gear
There are typically three different ways to select the gear on cars with Semi-Automatic options.
Paddles behind the steering wheel - This is how things are done on Formula 1 cars, and also cars like the Honda Jazz. There are two paddles behind the steering wheel, one on each side. Pulling them briefly towards you activates a switch to change up or down a gear (usually down on the left and up on the right).
Buttons on the steering wheel - This is like the paddles option, but instead of paddles, there are buttons on the steering wheel itself. These can either be one on each side, like with paddles, or (such as on the Lexus GS300, two on the front and two on the back. The two on the front go down and the two on the back go up.
On the gear shift - Some cars have the selection on the gear shift itself. In all cars which are automatic or Semi-Automatic, you select the mode on the gear shift, often by moving it to the side. On these cars, where the gear shift is used to select the gear, you then usually push it forwards or backwards to change up or down a gear. This is the method used on the Toyota Avensis.
Oh BTW nowadays most sports cars...and some family cars are being equiped with this technology.It wont be a surprise in a next few years...