Introducing the Sinclair ZX Spectrum Kempston Joystick Interface. This interface is compatible with every version of the ZX Spectrum.
 
It also features a reset button and a power indicator LED.
 
You can utilise it with all Kempston joystick models, including the iconic Atari joystick. Additionally, it is engineered to function with competition pro-style joysticks, enabling features like auto-fire, slow motion, and extra fire buttons. (auto-fire/slow-motion support may differ based on the game).