Every part of Sony's WF-1000XM4 headphones has been redesigned. For example, the Integrated Processor V1, specially developed by Sony, which suppresses more noise than ever before, a driver with improved performance, noise-sensing microphones and the innovative noise-isolating ear tips for an even better fit. Sony's WF-1000XM4 headphones support wireless High-Resolution Audio thanks to LDAC. With specially designed 6mm drivers, these headphones reproduce dynamic sound despite their small size, while the powerful diaphragm enables rich bass. The Integrated Processor V1 also improves sound quality and reduces distortion. Even compressed music files are upscaled, with advanced DSEE Extreme technology for an intense, all-encompassing listening experience. Speak-to-Chat automatically pauses music and switches to ambient sound when you're talking to someone. This means you don't have to put down the headphones with microphone if, for example, you don't have a hand free. Once you've finished talking, the music automatically resumes. Speak-to-Chat uses an accelerometer to detect and respond to your voice. The feature is based on Precise Voice Pickup technology, which combines four microphones and sensors with advanced audio signal processing.