Jts hp565 cuffia studio. The HP-565 is a brother of the successful HP-535. It has a strengthened headband to have further isolation. Low frequency has been emphasized to delight both professionals and consumers. Drive Unit Super thin 40mm diaphragm driver with neodymium magnet Frequency Response 20~20,000 Hz Sensitivity (at 1000Hz) 104 dB/mW Impedance 32Ω Power Handling 500mW T.H.D Less than 1% Input Connector 1/8'' gold-plated stereo phone plug and 1/4'' phone adaptor500mW Net Weight 350 grams