Panasonic on Ear Super Lightweight Headphone with Extra Bass System Lightweight, open-air design headphones weigh just 1.2 oz. without cable, Cable Length: 4.50 ft XBS port for increased bass response and neodymium magnets for full-range sound Wide headband and foam-cushioned earphones for added listening comfort Large-diameter driver units 30mm (1-3/16"), 3.5 mm connector Frequency response: 16 Hz - 22 kHz,Impedance: 16 Ohm