The AKG K 240 Studio is a professional semi-open studio headphone. It features a circumaural design with a self-adjusting headband for a comfortable fit. The headphones use a dynamic transducer and have a frequency range of 15Hz to 25kHz. The impedance is 55 ohms, and the sensitivity is 91 dB. The K 240 Studio has a detachable cable with a mini XLR connector. It is a popular choice among musicians, audio engineers, and producers.