Unisar noise cancelling headphonesCompact, lightweight and adjustableSoft cushioned ear pieces swivel for maximum comfortFolds flat for easy storageEliminates up to 85% of background noiseRequires one AAA battery (Energizer battery included)Battery lasts more than 50 hoursPerfect for traveling and use on airplanesIdeal for canceling unwanted noise while sleepingHigh quality stereo sound from any audio source, including computersHAY button lets you "hear around you" so you don't have to remove the headphones when someone talks to youCompatible with computers, iPads, cellphones, MP3 players, and other audio sourcesIncludes 1 headset, 1 storage pouch, 1 detachable audio cord, 1 airplane (double prong) adapter, 1 AAA Energizer batteryDriver unit: Dia. 40mm cobalt magnet108db sensitivity32 ohm impedance 20 20,000 hz frequency response6 month limited time warrantyUNINC480