These noise cancelling earbuds delivered outstanding sound quality and superior noise cancelling in tests conducted by the Hammacher Schlemmer Institute. The earbuds' advanced noise cancellation circuitry cancels up to 85% (20 dB) of background noise, providing crystal-clear sound when listening to music. Panelists praised the earbuds as the most effective at cancelling out ambient noise from an office, on a city street, and on an airplane. When listening to music, panelists observed that crisp, even tones could be heard free from distortion, unlike other tested models that provided muffled, blurred tones. One AAA battery (included) provides up to 50 hours of noise cancellation. Its adjustable 3 1/3' cable includes a control box that allows you to disable noise cancellation or mute all sound; terminates in a standard 3.5 mm stereo plug. Includes three sizes of earbuds and an airline adapter, all stored in the included carrying case. (1 1/2 oz.)