Item Type: MP3 PlayerMaterial: Metal, ElectronicOnboard Storage: 16GBMemory Card: Can Support 32/64/128/256GB Memory Expansion (Not Included)Bluetooth: Bluetooth 5.0Support: MP3/APE/FLAC/WMA/WAV/AACPhoto Format: JPEG/BMPE BOOK: TXT, LRCFM Radio: 87Hz-108HzSignal To Noise Ratio: Greater Than or Equal to 90dbOS: for Windows98, for ME, for 2K, for XP, for Vista, for Win7, for OS X 10Battery Type: Built In 500mAh Polymer Lithium Battery (Included)Package List1 x MP31 x Wired Headset1 x Charging CableExpanded memory card needs to be purchased with your own.1Full Screen Touch Control: Lossless MP3 player is touch button HD screen with high sensitivity and one touch to make you comfortable to use, making it convenient to collect favorite music. 2DAC Decoding Chip: MP3 music player uses a stronger DAC decoding chip to provide DAP for sound signals to meet more mainstream lossless and compressed formats. 3More Lossless Formats: Portable MP3 player supports MP3 APE FLAC WMA WAV AAC and other mainstream lossless and uncompressed formats music programs with up to 24bit support. 4Bluetooth 5.0 Transmission: Lossless MP3 player features a 3.5mm stereo line output port and uses bluetooth 5.0 transmission technology for faster and more stable transmission. 5Memory: Music player has 16GB built in flash memory and supports up to 256GB expansion memory card, music can be transcribed between the built in flash memory and memory card.