ALTEAM makes great headphones. The Active Noise Canceling feature is awesome. The noise canceling removes the hums and ambient noise made from airplanes, trains, noisy lights and equipment.

The cushioning is very soft making the headphones comfortable to wear. The headphones can operate whether the noise canceling feature is turned on or off. Volume control on the headphones allow you to easily adjust the sound without having to fiddle with your mp3 player. The case helps protect the headphones while traveling.

Specifications
Frequency Response: 20 ~ 20,000HZ
Power: AAA x2 Batteries
Impedance: 30 Ω ± 15%
Max Power Output: 100 mW
Noise Reduction: 70~1,200Hz
Auto Distortion: 0.05~1%
Driver Unit: 40mm special mylar
Battery Life: Approx. 40 Hours
Jack: 3.5mm Plug