Mystery auction: Sony WF1000XM4B

True Wireless Headphone - WF1000XM4B, Noise Cancelling, Hi Res Wireless, Waterproof, 24 hours, Black. The WF-1000XM4 True Wireless headphones combine industry-leading Noise Cancelling technology with high quality sound, intelligent listening features, water resistance, all-day battery life and comfort. Industry-leading Noise Cancelling. The WF-1000XM4 features Sony's built-in V1 processor, which cancels far more noise than ever before, a new speaker with improved performance, redesigned noise-sensing microphones and innovative noise-isolating ear cushions with a more stable fit. Exceptional sound quality. The WF-1000XM4 supports Hi-Res Wireless High-Resolution Audio (Hi-Res Wireless) thanks to LDAC technology. In addition, despite being very small, with 6 mm diaphragm units, these headphones reproduce a dynamic sound, and their powerful diaphragm provides a rich bass range. The integrated V1 processor also improves sound quality and reduces distortion. Finally, the enhanced DSEE Extreme technology scales compressed music files and provides a richer, fuller experience. Speak and listen intelligently. As soon as you talk to someone Speak-to-Chat will automatically pause the music and let in ambient sound so you can have a conversation; thanks to Precise Voice Pickup technology, which combines four microphones and sensors with advanced audio processing, as well as the acceleration sensor; the WF-1000XM4 recognize and react to your voice. Very practical if you want to leave your headphones on or have your hands full. When you finish your conversation, the music will start again automatically.