Fifteenth anniversary edition of "A Best" release from Ayumi Hamasaki includes 16 tracks total. Features remastering, using original master tapes by Stephen Marcussen. *This is a "Sumapura Music" compatible product, which enables you to listen to the contents on a mobile device in addition to CD player. [Recommended System Requirements] iOS7/Android4.0 or later. *This service expires two years after the release date. [Important Notes for "Sumapura Music" compatible product] No refund is possible after this product is sent. The record company has designed and optimized "Sumapura Music" for the market within Japan and registration at "Sumapura" site, available only in Japanese language, is required. They do not guarantee that it works outside of Japan.