Welcome to the store! 1. The button is backlit at night, making night operation more convenient. 2. Supports lossless formats like APE / FLAC, supports lyrics synchronization, background playback. 3. Supports AMV/AVI video playback. High-quality lossless audio quality, 5D sound effect. 4. TXT e-book format, memory reading. 5. Built-in dual PCM microphones, supports remote recording. Long battery life, can be charged for 1.5 hours, can play for 48 hours. Supports convenient folder classification. FM function can not only play broadcasts, but also record and save. One-button lock screen, simple and convenient. Supports OTG downloader (requires mobile phone to support OTG function). Bluetooth CSR4.2, better wireless audio quality. Specification: Name: Portable Bluetooth MP3 Player Model: M13 Material: CNC metal, hyperboloid glass cover Built-in memory: 4G /8G / 16G /32G Resolution: 128 * 160 Bluetooth version: CSR 4.2 Battery power: 800mAh Frequency response: 20Hz-20KHz Charging time: about 1.5 hours Playback time: 48 hours Reading time: 78 hours Distortion: <0.008% Recording format: MP3/WAV Playback format: MP3/WMA/WAV/Mono/FLAC Signal to noise ratio: > 90db Size: 8.5 * 4 * 0.7cm Weight: about 50g 1 x MP3 player 1 x headphones 1 x connection cable 1 x user manual Your satisfaction is our top priority. We will provide you with the best service. If you encounter any problems after receiving the product, such as damage, incorrect quantity, etc., please contact us immediately and we will provide you with the best solution!