As stated in my profile, I am sorry, but I do not accept price negotiations. Thank you for your understanding. Also, as a private seller, please forgive me for not being able to ship as quickly as a business. This item was purchased from the Sony Store (online) in April 2022. I tried various methods, but unfortunately, they don't fit my ears well, so I've decided to sell them. Everything in the photos is included. This includes the main unit, case, box, instruction manual, and USB charging cable. The warranty card is blank. I have also attached screenshots from the Headphones Connect app on my Android smartphone. In my subjective opinion, I have taken good care of them, so the condition is not bad. (This is just my personal opinion...) Main unit software version: 2.0.0 (released 2023/4/20) Serial number: 5244410 I have not confirmed all the functions of this product. Please be aware that there is a possibility of problems arising after purchase due to usage, aging, etc., depending on the buyer's environment. Please consider this before making a purchase. I don't think this product is suitable for those who are looking for a brand-new, unopened condition and quality like when it left the factory, or for those who cannot handle various troubles themselves, including Bluetooth connection settings. I apologize, but please refrain from purchasing. For detailed product specifications, it is best to refer to the product page: www.sony.jp/headphone/products/LinkBuds/ As a precaution, I will wipe the main unit with disinfecting wet wipes before sending it. Connection type: Wireless Features: Bluetooth