I'm selling this item because I won it as a prize, but I don't plan to use it. Unopened. Retail price: ¥1,980 Cassette-shaped keychain with a built-in NFC chip - You can call up your favorite songs, albums, and playlists from streaming services anytime. - You can access a pre-written URL by bringing a smartphone close to it. - The built-in NFC chip can be rewritten as many times as you like with the "BUDDY" app.