Bowers & Wilkins PX Space Grey

Bluetooth 4.1 with aptX-HD Adaptive noise cancellation Up to 22 hours of battery life Natural UI user interface: Built-in sensors perform functions such as stopping audio when you remove the headphones Circumaural 40 mm Driver unit Frequency range: 10 - 20-000 Hz Sensitivity (@ 1 kHz): 111 dB/V Impedance: 22 Ω Connections: USB-C and 3.5 mm stereo jack (cable included) Weight: 335 g.