Over 2 million units sold in the series. Wireless world-class audio performance. Lightweight over-ear model designed for ease of use. As an entry-level model in the M series, the ATH-M20x professional monitor headphones are highly regarded in studios around the world. The studio sound with a long history is now portable. The φ40mm driver, which reproduces powerful bass with a wide frequency range and flat characteristics, provides wireless sound quality equivalent to the wired model ATH-M20x. In addition, it is equipped with a multi-point function that can connect to two wireless devices simultaneously, a low-latency mode that reduces the lag between sound and video for smooth gaming and video enjoyment, and a maximum of 60 hours of continuous use and a 10-minute quick charge that provides up to 3 hours of use, pursuing ease of use. A microphone and buttons are built into the left earcup, allowing for intuitive operation of calls, music playback, volume adjustment, and more at your fingertips. You can enjoy the audio performance of the world-renowned studio monitor more freely and comfortably. <Specifications> Communication method: Bluetooth standard Ver.5.0 compliant Supported codecs: AAC, SBC Type: Sealed dynamic type Driver: φ40mm Output sound pressure level: 100dB/mW Usable time: Continuous communication (during music playback) Approximately 60 hours (Varies depending on usage conditions.) Accessories: Charging USB cable (30cm, USB Type-A / USB Type-C), Instruction manual and other documents ★Product Condition★ This is a used item. Used for a few hours after new purchase. Used only for testing. Operation has been confirmed. There are no noticeable scratches on the main unit, and it is in good condition. Everything in the photos is included. Purchase certificate is not included. Please refrain from purchasing if you are nervous as it is a used item. Immediate purchase is OK.