I purchased this before, but I'm selling it because I don't use it. It is new and unopened. Manufacturer: SONY Model Number: WF-LS900N-CC JAN: 4548736140530 [Product Description] ● Compact and lightweight design with meticulous attention to detail ・By reviewing the device layout within the main unit and case, we have achieved a compact and lightweight design for both the main unit and the case. Even women and those with small ears can wear them comfortably for extended periods. The main unit weighs approximately 4.8g each, and the case weighs approximately 35g, making them lightweight and convenient to carry. ● Improved wearing stability ・In addition to the small and lightweight design, reducing the amount that protrudes from the ear provides a stable fit because the center of gravity of the earphones is closer to the head. ・We have adopted an "ergonomic surface design" that increases the contact surface between the earphone body and the ear. The shape is designed to be less likely to interfere with the complex irregularities of the ear, providing comfortable use. ● Volume adjustment and mode change for external sound intake ・The level of external sound intake can be adjusted in 20 steps. ・By turning on Voice Focus, you can reduce noise while taking in surrounding sounds, making it easier to hear only people and announcements. ・You can set your preferred level of external sound intake, allowing you to enjoy music comfortably depending on the situation. ● Wind noise reduction structure ・We have adopted a mesh that encloses the internal microphone to minimize wind noise during noise canceling and external sound intake. ・You can spend time comfortably even in strong winds. ● Improved performance of the "Speak-to-Chat" function, which allows you to have conversations while wearing headphones ・Even while listening to music, you can simply speak to pause music playback and switch to external sound intake mode, allowing you to start a conversation without using your hands while wearing headphones. ・The headphones detect vibrations of the wearer's voice and distinguish and recognize it from surrounding sounds, activating Speak-to-Chat. ・Voice pickup has been increased compared to previous models, making your voice clearer. [Specifications] ● Type: Sealed dynamic ● Driver unit: 5mm ● Continuous music playback time: Approximately 6 hours ※ When noise canceling is ON ● Waterproof: IPX4 ● Weight: Approximately 4.8g x 2 ● Communication method: Bluetooth standard Ver. 5.2 ● Output: Bluetooth standard Power Class 1 ● Maximum communication distance: 10m