PSB MFU 2 Headphones folding, over-the-ear design with closed, padded earcups and adjustable headband active noise-canceling technology reduces distracting external sounds active listening mode uses built-in headphone amplifier for more powerful and precise audio with portable sources tri-mode operation allows passive listening (without batteries), active listening mode, and active listening mode with noise cancellation in-line remote/microphone for hands-free use with iPod®, iPhone®, and iPad® in-line push-to-hear monitor control pauses the audio source and noise-canceling feature for brief conversations without removing headphones convenient dual input connections let you plug the cable into the right or left earcup large 40mm drivers for low distortion and extended range frequency response: 20-20,000 Hz (±1.5dB) sensitivity: 102 dB impedance: 32 ohms (passive mode); 10k ohms (active/noise canceling mode) Fresh Earpads Included
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