The MDR-NC40 noise-cancelling headphones from Sony provide a pleasurable listening experience for travel, or around the house. The lightweight foldable design features an adjustable headband and comfortable ear cushions to provide a comfortable, low-pressure fit.
Active noise cancellation technology helps to dramatically reduce ambient noise by up to 80 percent. The headphones operate for up to 40 hours on a single AAA battery. If desired, the noise cancellation can be switched off, allowing you to use the headphones without a battery.
Large neodymium drivers provide a rich, detailed sound response that puts you right in the middle of your music. A convenient airplane adapter is included for in-flight listening, and a carry case makes storage and portability a breeze.
| Type | Noise-Cancelling |
| Frequency Range | 14Hz - 22kHz |
| Impedance |
68 Ohms (NC On) 30 Ohms (NC Off) |
| Sensitivity |
102dB (NC On) 100dB (NC Off) |
| Maximum Input Power | Not Specified by Manufacturer |
| Connectors | 3.5mm Stereo Mini Plug with Airplane Adapter |
| Cable Length | 4.9' (1.5m) |
| Weight | 2.8 oz (80g) (Including Battery) |