Sony MDR-NC10

Reduces Noise by 70% (10dB) when noise canceling circuit is switched on
Ideal For Travel gives you peace and quiet on planes, trains, buses and cars; quiets noisy air conditioners
Ideal For Work helps you shut off outside noise and concentrate on the job at hand
Ideal For Getting Sleep in noisy environments, including dormitories, hotel rooms and planes
Ideal For Outdoor Use when gardening or on a noisy street
Ideal for Music lets you listen to music through the headphones, while the noise canceling circuit reduces outside sound
Noise Canceling Circuit actually senses outside noise with built-in microphones and sends an equal-but-opposite canceling signal to the headphones; cancels noise from 50Hz to 1,000Hz, with a maximum of 10dB noise cancellation in the critical range from 100 to 400 Hz --where the human ear is super-sensitive
Noise Canceling On/Off Switch located on the battery box; red Power LED indicates when Noise Canceling is operating; when Noise Canceling is off, headphones continue to function for music listening
Hot Line Switch to admit outside sounds temporarily
Extended Battery Life approximately 60 hours with a single AAA alkaline battery
Additional Noise Reduction thanks to the structure of the headphones, which serves to physically block outside noise
Fontopia® In-The-Ear Design fits snugly, yet comfortably inside the ear; eliminates the headband so you can enjoy music while exercising, skating or dancing
Detachable Input Cord to connect an audio source and listen to music
Gold-Plated Mini-Plug to connect an audio source; provides exceptional corrosion resistance, superb conductivity, low noise
Type: Lateral, In-the-ear, Closed, Dynamic (with Noise Cancellation)
Driver Unit: 13.5mm

Power Source: "AAA" x 1 Battery
Battery Life: Approx. 60 hrs (alkaline)
Approx. 30 hrs (manganese)
Power Switch: Manual, on battery box
Noise Reduction: >10dB at 300Hz
Impedance: NC Power On: 27 ohms
NC Power Off: 16 ohms
Sensitivity: NC Power On: 106dB/mW
NC Power Off: 104dB/mW
Power Handling Capacity: 100mW

Frequency Response: NC Power On: 10 - 22,000Hz
Cord and Plug: 2.5 ft (0.8m) cord to battery box
Separate 1.5ft (0.6m) cord to connect battery box to audio source, with fold-plated stereo micro plug, L-shaped stereo mini-plug to the audio source