Able Planet's True Fidelity headphones fit around your entire ear to preserve sound quality and block outside noise. But should external noises become too heinous of a distraction, simply toggle on the headphone's noise cancellation technology, which actively neutralizes external sounds. This lets you fully experience the high-quality sound generated by the headphones' LINX AUDIO technology. Combined with active noise cancellation, LINX AUDIO maximizes speech clarity, reduces distortion, and prevents electromagnetic interference so you can get all the MRIs you want while still listening to your music. Product: NC300BT Noise-canceling headphones Around-the-ear fit LINX AUDIO technology In-line volume control Foldable design 3.5 mm plug Noise cancellation runs on one AAA battery (included) Frequency response: 20Hz¿20kHz Sensitivity: 115 dB/kHz (off), 121 dB/kHz (on) One-year warranty from Able Planet Dimensions: 6"x4"7" Weight: 1.3 lb.