The AKG K 240 DF Studio Monitor is a professional-grade headphone primarily designed for studio monitoring and critical listening. It features a semi-open design, which provides a balanced sound with accurate imaging and natural soundstage. The headphones come with dynamic transducers and a frequency range of 15Hz to 25kHz, offering a wide range of audio reproduction. The K 240 DF has a detachable cable for convenience and comes with a standard 3.5mm stereo mini-jack and a 1/4-inch adapter. It is known for its durability and comfort, making it suitable for long listening sessions.