B000629GES Sony MDR-NC6 Noise Canceling Headphones (Discontinued by Manufacturer)

Reduces exterior noise by more than 70 percent (10 dB at 300 Hz) so you can hear music against a quieter background
Active noise reduction from 40 to 1,500 Hz using 1 AAA battery (not included); extended battery life approximately 30 hours
Compact size and folding design allows easy storage in a backpack, briefcase, or purse
Noise-canceling on/off switch; headphones work with or without power
Includes soft carrying case and airplane adapter plug