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Here are some of the great features of Sony MDR-NC40 Noise Canceling Headphone (Black)
Sony MDR-NC40 Noise, Shut out up to 80% of the ambient noise around you with the MDR-NC40 noise canceling headphone. Great for work, traveling or just when you're trying to sleep in a loud place, they provide a calming atmosphere no matter where you are. The pressure-relieving cushion offers premium comfort, and the lightweight, folding design makes storing them a breeze. Includes a premium travel case and "AAA" batteries.
Comparison feature
 MDR-NC7 Noise Canceling |  MDR-NC13 Noise-Canceling |  MDR-NC40 Noise Canceling |  MDR-NC100D Digital Noise Canceling |  MDR-NC200D Digital Noise Canceling |  MDR-NC300D Digital Noise Canceling |  MDR-NC500D Digital Noise Canceling | |
| Driver Units | 30mm | 13.5mm | 30mm | 13.5mm | 40mm | 16mm | 40mm |
| Ambient Noise Reduction | ✓ | ✓ | ✓ | ✓ | |||
| Digital Noise Canceling with Intelligent Auto Selection | ✓ | ✓ | ✓ | ✓ | |||
| Passive Listening Mode | ✓ | ✓ | ✓ | ✓ | |||
| Monitor Button | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | |
| Battery Life | 25 hours* | 50 hours* | 20 hours* | 22 hours* | 22 hours* | 20 hours* | 15 hours* |
| Folding/Swivel | ✓ | ✓ | ✓ | ✓ | |||
| Design | Over-the-head | Earbud | Over-the-head | Earbud | Over-the-head | Earbud | Over-the-head |
| Carrying Case/Pouch | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
- High quality noise canceling
- Passive Operation Even When Power Is Off
- Lightweight, Noise-Canceling Headphones For Long Flights
- Pressure-Relieving Urethane Cushion For Comfortable Fitting
- Compact Folding
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