Creative EP-3NC In-Ear Noise Cancelling Headphones (Discontinued by Manufacturer) Measures external ambient noise using active noise-cancellation circuitry, works to reduce noise by up to 90% Noise-isolation with ergonomic in-ear design; passive mode functions without the need for a battery. Built-in monitor function on the dongle lets you hear surrounding sounds whenever you need, without having to take off your earphones. Battery life of up to 100 hours of music entertainment with a AAA alkaline battery Closed type earphones powered by 9mm neodymium drivers; for use with all types of digital playback devices.