The PXs use the latest aptX HD technology with audio resolution up to 48 kHz / 24 bits and are able to offer the highest performance even through the USB connection. Then upsampling and audio processing at 768kHz, they maintain the best audio quality possible from all sources. The PX design follows the tradition of Bowers & Wilkins using only high quality materials, while simultaneously offering a distinctive and original look. The headphones are equipped with elliptical cushion ergonomically designed for superior comfort. Better acoustic insulation, battery with 22 hours of autonomy and soft leather bow.