Mp3 player adopts Bluetooth 4.2 wireless technology, which makes its connection with your Bluetooth headset/headphones and speakers have higher transmission speed and stability. The device does not support the installation and use of the app, including but not limited to Audible, Amazon Music, iTunes, Spotify, Youtube, Apple Music, Pandora, Google play, etc. The device cannot connect to the car audio via Bluetooth. Please download and read the user manual.pdf before or during use. The product is available in a variety of colors, sizes the music player uses the same touch screen technology as the current mainstream mobile phone to provide you with a more interactive interface. It supports high-resolution video (including 720p,1080p) playback and does not require conversion of video formats. The mp3 player is perfectly compatible with MP3, RMVB, AVI, MKV, WMV, VOB, MOV, and FLV. The player has built-in FM radio, The radio station can be searched automatically. Mp3 player has a built-in 8G storage capacity and micro sd slot for expandable memory. It also supports up to 128G external TF card, so you can store more music, videos and audiobooks, images, even working files, anytime, anywhere. Its unique 4-inch screen, with four optional reading backgrounds and font sizes, makes the player's e-book feature particularly impressive, giving you a very comfortable reading experience. The device uses Type-C fast charging technology, which makes it have the following advantages.