[70 hours long battery life]: Built-in Lithium ion polymer 420mAh battery. Up to 70 hours playback, fully charged within 2-3 hours by USB charging cable. Enjoy your wonderful musical journey.[ Large Memory capacity]: Supports up to 128GB Micro SD Card (Please use Kingston memory card to avoid compatibility problem ).[ Lightweight & Portable ] : Palm size and light weight, easy to put into your wallet, pocket, or armband . Easy to carry, especially when you take exercise, running, jogging, traveling and hiking.Perfect companion for your sports.[Slim design, easy to use]: A02S Music Player designed with classic buttons and simple navigation. Also great audio player for kids. Download is easy, Just drag and drop the music file or folder directly when connecting to computer. Works perfectly with Car via AUX port. [Lossless sound quality]: Support formats:MP3, WMA, OGG,WAV, APE, FLAC, AAC-LC, ACELP. (Requirements for APE and Flac:8KHz-48KHz, 1000Kbgs)Note It does not directly support Audiobook and iTunes.Brings you amazing listening experience.