The HamiltonBuhl NC-HBC headphones are specially-designed to reduce harmful and annoying low frequency sounds in noisy environments. Comfortable for extended use, the over ear leatherette ear cushions offer added passive noise reduction. The 5 foot braided nylon cord make this unit ideal for use with tablets, mobile devices and any unit with a 3.5mm stereo headphone jack. Runs on one "AAA" battery (not included). Includes zippered carry case for protection and easy storage.