Item Type: MP3 PlayerMaterial: Metal, ElectronicsScreen: 2.4 Inch TFT ScreenBody Storage: 4GBMemory Card: Up to 256GB Memory Expansion (not Included)Bluetooth: Bluetooth 5.0Support: MP3, APE, FLAC, WMA, WAV, AACPhoto Format: JPEG, BMPBook Format: TXT, LRCFM Radio: 87108HzSNR: 90dbOS: for Windows 98 ME 2K XP Vista 7, for OS X 10Battery Type: Built in 500mAh Polymer Lithium Battery (Included)Package List1 x MP31 x Wired Headphone1 x Charging Cable1FULL TOUCH SCREEN: Bluetooth MP3 player has a 2.4 inch full touch screen that supports touch operation for fast and fluent use. 2DECODER CHIP: MP3 player uses ESS SABRE9018Q2C DAC decoder chip to provide DAP of sound signal to meet more mainstream lossless and compressed formats. 3MULTI FORMATS: MP3 music player supports MP3, APE, FLAC, WMA, WAV, AAC and other mainstream lossless and uncompressed format music programs, up to 24bit, so you can use it more easily. 4MULTI OUTPUT: Touch screen MP3 player has 3.5mm stereo line output jack and uses Bluetooth 5.0 transmission technology for faster and more stable transmission. 5EXPANSION SPACE: Music player has a built in 4GB flash memory and supports up to 256GB memory card (not included) expansion memory, so you can transcribe music between the built in flash memory and memory card.