JVC HAG77 Closed Over Ear Headphones with 50mm Driver (Discontinued by Manufacturer) Wide (10 to 25,000 Hz) frequency response, high (110 dB/mW) sensitivity Large 50 mm diameter driver unit with powerful neodymium magnet for full-bodied, dynamic sound with rich presence Soft, comfort-fit headband for perfect fit without any adjustment Single-ear 11.5-foot cord won't interfere with listening Oxygen-free copper cord and gold-plated plug and adapter ensure accurate sound signals