70 hours long battery life: Built-in lithium-ion polymer 420mAh battery. Up to 70 hours of playback time on a full charge. Fully charged within 2-3 hours using the included USB charging cable. Enjoy uninterrupted music on the go. Large memory capacity: Supports up to 128GB microSD card (Kingston memory card recommended for best compatibility). Lightweight and portable: Compact palm-sized design with lightweight build. Easily fits into your wallet, pocket, or armband. Convenient to carry during exercise, running, jogging, traveling, or hiking. Ideal companion for sports and outdoor activities. Slim design, easy to use: Features classic button controls and simple navigation. Suitable for all ages, including kids. Easy file transferjust drag and drop music files or folders when connected to a computer. Compatible with car audio systems via AUX port. Lossless sound quality: Supports multiple audio formats including MP3, WMA, OGG, WAV, APE, FLAC, AAC-LC, and ACELP. (APE and FLAC support 8kHz48kHz, up to 1000kbps). Note: Does not support Audiobook or iTunes formats. Provides an exceptional listening experience.