The Wii Zapper is a plastic shell with a design reminiscent of a sub machine gun. The Wii Remote clips into the top of the shell, acting as the "barrel" of the gun. The Nunchuck clips into the shells rear handle, with the wire between the two controllers held securely in the body of the Zapper. A trigger built into the shell depresses the B button when squeezed, giving the Zapper its "trigger".