This item has been used for many years. The right earbud charges, but no sound comes out. The left earbud and the charging case work fine, and can be charged. The left earbud's button also works well, allowing you to lower the volume with a long press and raise it with a single touch. There is a black dot-like mark on the charging case. Please don't expect much from the battery. The ear tips have been discarded and disinfected. The box, replacement ear tips, charging cable, warranty, etc., are not included. This is a set of 3 items: the charging case, the left earbud, and the right earbud (defective). No price reduction. Instant purchase is OK.