Wireless over-ear headphones that combines advanced acoustic technology with aptX Bluetooth connectivity to deliver a seamless audio experience and 17 hour battery life. They have an innovative foldable design and come supplied with a secure carry case for easy portability. The 40mm full-range drivers with nylon damped cones and CCAW coils have been engineered the same way as the drivers in B&W's reference loudspeakers. The ear pads with detachable, dual-cavity memory foam cushions are designed to optimise air-flow and block outside noise. The headphones are also equipped with two microphones supporting CVC2 algorithm for answering calls and micro USB 2.0 port for battery charging, service and fireware update. Frequency range: 10 Hz-20 kHz. Impedance: 22 Ohm (passive). Distortion: <0.3%. Sensitivity: 111 dB/V. Max. input power: 50 mW. Weight: 323 g.