The Sony MDR-ZX110NC Noise-Canceling On-Ear Headphones utilize 30mm dynamic drivers to deliver an extended low frequency response of 10 Hz to 22 kHz so you can enjoy all kinds of music on-the-go. Active noise cancellation helps reduce ambient noise by up to 95% or 13 dB so you can listen to your music with minimal distractions. A single AAA battery powers ANC for up to 80 hours of listening before needing to be replaced. The headphones can be used passively, in case the battery is depleted or you wish to maintain some situational awareness. For improved portability, the earcups can swivel flat and fold up into a more compact form factor. The 3.9' Y-type cable helps prevent tangles.