This sleek, noise-isolating headphone with volume control is the perfect addition to any classroom. It boasts a 20Hz- 20KHz impedance, a 9-foot cord, leatherette ear cushions, replaceable volume control on ear cup, automatic stereo/ mono plug, and is compatible with a multitude of devices including iPods, iTouches, MP3 Players, iPhones, cell phones, iPads, Tablets, eReaders, computers (Mac and PC), CD players, stereos, TVs, most gaming systems, cassette players, and record players. Also includes a moisture-resistant re-sealable bag that kills head lice in 24 to 48 hours without the use of chemicals.