The Numark HF125 headphones come with a 1/4" (6.35mm) jack socket, making them compatible with keyboards, DJ equipment, digital drum kits, and more. They feature a 1.8-meter cable, providing extra length for convenience, especially when using a headphone splitter. These sturdy and reliable headphones offer great sound quality, making them a valuable purchase for educational use, amplified instruments, or private listening on computers. With great quantity discounts and minimal packaging, they are ideal for schools or institutions.