Apparently this is not a real joystick, but for many fans of Street Fighter IV, the joystick shaped voice keychain is absolutely excellent exercising gadget.
The Street Fighter IV keychain is made of plastic material, and shaped as a classical arcade game controller with one joystick and two buttons. It measures 67 x 37 x 27 mm, and comes with a built-in speaker playing the actual voice of the character in Street Fighter IV. Of course, you must complete the combo action of joystick and buttons before some special voices out. Check out the Street Fighter IV key chain in action.
The Street Fighter IV joystick voice key chain comes in seven types according to different characters, including Ryu, Guile, Ken, Akuma, Sagat, and Chun-Li as well Dhalsim. Each one is priced at $9.9 USD. If you want one, the key chain is available at Strapya-World.