This product has been tested and cleaned, so you can use it with confidence. These are smart glasses that combine blue light cut glasses and open-ear speakers. You can also use them as sunglasses by replacing the included lenses. The sound was clear and easy to listen to, without any peculiarities. They are discontinued, so they are rare and difficult to obtain. You can also change the sound environment with a smartphone app. Other accessories include a dedicated case and a dedicated cleaner. ☆ I also have PC-related products, game consoles, etc. for sale. #DIMC ☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆★☆ Thank you for your interest in the product. Please read the following description before purchasing. [Product Description] Product Name: Razer Anzu - Lenses Brand/Manufacturer: Razer https://www.razer.com/jp-jp/mobile-accessories/razer-anzu-lenses?srsltid=AfmBOorbCYd0mKE4BKcjodQaelxmCcEDOyhA7jM9Os4n_IG0ZevxTr1t [Product Condition] Used, working [Confirmed Operations] Smartphone Bluetooth connection Sound test [Maintenance] Exterior cleaning We have not checked consumable parts such as batteries. [Shipping] We will ship via Mercari shipping after wrapping in air-cushion packaging. We will ship on the same day if possible. [Notes] Returns are not accepted for hygiene reasons. Since this is a used product, there may be scratches that are not visible in the photos. Please also accept minor imperfections. If you have any other questions, please feel free to comment.