The Sennheiser HD 206 headphones feature a closed-back design that offers passive noise isolation, making them suitable for home recording and preventing sound from leaking into adjacent microphones. They are wired headphones with a lightweight and comfortable design, making them ideal for extended listening, studio sessions, or DJ use. The headphones have a 24-ohm impedance, ensuring compatibility with various devices such as cell phones, tablets, computers, portable audio players, and studio recorders. They come with a 1/8 inch plug (3.5 millimeters) and include a 1/4 inch (6.3 millimeters) adapter for added versatility in connecting to different audio equipment. Overall, the Sennheiser HD 206 headphones are a reliable and versatile choice for various listening and recording applications.