Sony WH-1000XM4/B Wireless Noise Canceling Over-Ear Headphones w/ Google Assistant - Black (Retail price: $349) All products are store returns. All headphones have been inspected and tested, restored to factory settings and show minimal to none signs of wear. Come without retail box/case/accessories. Manuals and other documentation can be found on the manufacturer’s support site. What's included: - Headphones - USB Type-C charging cable No retail box, no case, no other accessories included. Specifications: Headphone Type: Closed, Dynamic Driver Unit: 1.57" dome type Magnet: Neodymium Diaphragm: Aluminum Coated LCP Frequency Response: 4 Hz - 40,000 Hz Battery Charge Method: USB Battery Charge Time: Approx. 3 Hours (Full Charge) Bluetooth Version: 5.0 Volume Control: Touch Sensor Input: Stereo Mini Jack Weight: 9 oz. Industry-leading noise cancelation Industry-leading noise cancellation technology means you hear every word, note, and tune with incredible clarity, no matter your environment. These noise canceling headphones feature additional microphones that assist in isolating sound for a reduction of even more high and mid frequency sounds. The technology that makes it happen Dual noise sensor technology, featuring two microphones on each earcup, captures ambient noise and passes the data to the HD Noise-Canceling Processor QN1. Using a new algorithm, the HD Noise-Canceling Processor QN1 then applies noise-canceling processing in real time to a range of acoustic environments. Working together with a new Bluetooth Audio SoC (System on Chip), it senses and adjusts to music and noise signals, as well as acoustic characteristics between the driver unit and ears, at over 700 times per second. Optimizing noise canceling To maximize noise-canceling performance, the WH-1000XM4 headphones incorporate two technologies: Personal Noise-Canceling Optimizer, designed specifically for you, and Atmospheric Pressure Optimizing, designed specifically for air travel. Ambient Sound Control Adjust ambient sound with the Sony | Headphones Connect app to cancel noise while still allowing essential sounds, like overhead announcements, through when you're listening on the move. Wireless freedom, premium sound LDAC transmits approximately three times more data (at the maximum transfer rate of 990 kbps) than conventional BLUETOOTH audio, allowing you to enjoy High-Resolution Audio content in exceptional quality, as close as possible to that of a dedicated wired connection. Sound you can believe in A built-in analog amplifier integrated in the HD Noise-Canceling Processor QN1 realizes an unmatched signal-to-noise ratio for low distortion and exceptional sound quality for portable devices. Powerful 1.57" drivers, with Liquid Crystal Polymer (LCP) diaphragms, make the headphones perfect for handling heavy beats and can reproduce a full range of frequencies up to 40 kHz. Real-time restoration of all your compressed files Using Edge-AI (Artificial Intelligence) co-developed with Sony Music Studios Tokyo, DSEE Extreme (Digital Sound Enhancement Engine) upscales compressed digital music files in real time. Dynamically recognizing instrumentation, musical genres, and individual elements of each song, such as vocals or interludes, it restores the high-range sound lost in compression for a richer, more complete listening experience. Smart listening technology to enhance your listening The WH-1000XM4 headphones use an array of smart technologies to create a seamless, hands-free listening experience. For example, simply start speaking to automatically pause your music in Speak-to-Chat, or enjoy adaptive playback thanks to the proximity sensor and two acceleration sensors that detect whether your headphones are being worn or not. For everyday convenience, just Speak-to-Chat As soon as you speak to someone, Speak-to-Chat automatically stops the music and lets in ambient sound so you can conduct a conversation—handy if you want to keep your headphones on, or your hands are (description exceeds maximum possible length)