Name: MP3 player USB data storage: USB 2.0 Supported music formats: mp3, wma, wmv Battery capacity: 160mA Charging time: 2 hours Charging port: USB Micro Headphone Jack: 3.5MM(0.14in) Playback time: about 6 hours (headphone listening) Storage Expansion: Supports up to 128GB micro sd card (not included) Colour: white/black/blue (optional) Size: 85*25*10mm(3.35*0.98*0.39in) Material: ABS Packing list:1pc MP3 player (micro sd card not included) Features: Support built-in expansion up to 128GB. At the same time with mp3, mobile storage disc function. Support external playback, you can enjoy music without headphones. Built-in high-energy rechargeable lithium battery, long standby time. Support digital music playback in various mp3 music formats. Use USB2.0 interface, support hot-swap, plug and play. Can be used as a mobile flash drive to store MP3 music or data anytime and anywhere. Built-in 160mAh lithium battery, can play continuously for 6 hours without external power supply. Use multiple operating platforms win98/se/me/2000/liuxcore2.4 and above. Fashionable and compact shape design, exquisite workmanship, can be used as a beautiful gift. Stylish shell, innovative ultra-thin design, ultra-small size. Weighing less than 30 grams, simple, delicate and elegant.