BIGBANG Official Light Stick Purchased over 10 years ago at a CD shop in Korea. Light-up function confirmed. Please refrain from purchasing if you are concerned about the long-term storage. Only purchase if you understand. Batteries are included. The positive (+) side is down. Two batteries are required. Replacing the batteries is quite difficult, so please search online for instructions when replacing them. There is a mark from the manufacturing process, as shown in the last image, which was present from the time of purchase. Please understand. Instant purchase OK