・Main unit: Works without any problems. The battery may be depleted, but I didn't notice. ・Left earbud: The battery may also be degraded, but it works without any problems. (It works without any problems for at least 3-4 hours) ・Right earbud: I tried to replace the battery and disassembled it, but I failed, so the right one is a junk item. Please check the photos for the scratches that occurred during the work. ⭐︎I am also selling a battery replacement set, so please check it out if you are interested. SONY wireless earbuds equipped with high-performance noise-canceling function. - Brand: SONY - Model number: WF-1000XM4 - Color: Black - Features: Noise-canceling function - Battery capacity: 310mAh