Phillips SHN2500: Active Noise Canceling Earbuds Active noise canceling eliminates background noise and enhances listening pleasure Dual cone shaped ear-plug for perfect fit, neck strap enhances comfort and stability 9mm neodymium magnet for greater sensitivity and better bass boost Frequency response: 40Hz-20kHz; In-line volume control for level control; 4' OFC cable with 3.5mm mini-plug Includes airplane adapter, 1/4" adapter, storage pouch and 1 AAA battery