The Jammer is an arcade-style controller for the Nintendo Entertainment System made by Beeshu. It is a clone of Nintendo's officially-licensed arcade controller, the NES Advantage. On this controller, the turbo buttons are labeled "dial-a-speed" buttons. Beeshu also manufactured other controllers called the Superstick, Ultimate Superstick, Zipper, Zinger, and Zoomer.
References
Jammer (NES accessory) Wikipedia(Text) CC BY-SA