The perfect travel companion
Don't leave home without them. Noise Canceling Earbud Style Travel Earphones reduce outside noise by 92%. Relax and enjoy long operation time (up to 40 hours) with 1xAAA alkaline battery. Compact pen-type design conveniently clips to clothing and features noise canceling switch and slide volume control. S/M/L earpads, air plug, and carrying pouch included.
Noise Canceling explained
When you hear background noise from an aircraft or car engine, etc., sound waves are formed.