The Bose QuietComfort 3 Headphones feature an over-the-ear headband design that delivers a nice listening experience. For added convenience, the frequency range covered by this model is 2 Hz to 20 kHz. With 16 ohms impedance level and 106 dB sensitivity, this pair of black/silver headphones produces an authentic sound. In addition, this wired model weighs 11 g only. These noise-cancelling headphones are powered by a rechargeable lithium-ion battery.