SONY wireless earbuds, the WF-1000XM4. This model is no longer in production by the manufacturer. Please check the official website for detailed specifications. I purchased these new on Amazon in November 2021 and used them frequently for about 3 years. The charging case was kept in a silicone cover case, so there are no noticeable scratches. As for the earbud units themselves, there is a slightly noticeable dent on the left earbud (see photo 12). I did not use the original ear tips, as I replaced them with aftermarket ones. The battery condition has deteriorated compared to when they were new, and the right earbud in particular runs out of battery in about 2 hours even when fully charged to 100%. They have been initialized. The original box and all accessories are included. Operation has been confirmed, but due to the high frequency of use, there is a possibility of malfunctions. Please consider this as a junk item. Please purchase only if you agree to the above conditions. If you have any concerns, please leave a comment and I will add photos, etc. #SONY #Sony #WirelessEarbuds #Earbuds #WF1000XM4 #NoiseCanceling #Black