Beyerdynamic T70P Closed-Back Headphones Closed design, two versions available: T 70 for use at home, T 70 p for use on the move, with smart and cell phones, tablets and laptops Tesla technology with highest efficiency, 5 Hz - 40.000 Hz, Power handling capacity 200 mW, Max. SPL 125 dB (200 mW / 500 Hz). Inpendance: 32 Ohm (T 70p), 250 Ohm (T 70) Closed design; excellent ambient noise attenuation to quiet those annoying outside sounds, 18 dB Max comfort, 11 oz -- Headband and ear pads made of micro velours Supplied with carrying case. 1/4 and 1/8 gold vapor adapter and in-flight adapter