Security: --One-click screen lock function --Two ways to unlock the screen: mode unlock and password unlock --2.5D tempered glass lens --More Functions --Android 8.1 --Use Google play store --2G running memory --Comes with 16G RAM --Supports up to 128GB TF card storage --3000mA polymer battery --Built-in speaker --Support music background playback --Support date and time display --Support APK installation --Real octa-core CPU runs faster, smoother, etc. --This product is just like a smartphone except it can't make phone calls! Specification: --Product Name: WiFi MP3 Player --Product Model: M500, M400 --Screen Material: IPS --Resolution: 480*800 --Operation mode: touch control --Bluetooth version: 5.0 --Screen size: 5.0, 4.0 inches (optional) --Running memory: 2GB ROM +16GB --Recording format: MP3/WAV --Battery capacity: 3000mAh --Charging interface: type-c --Input voltage: 5V1A --Charging time: 2 hours --Play mode: repeat play, single loop, full loop, breakpoint play, sound equalizer --Music playback: 40 hours (resting screen using 3.5MM headphones) (lab data) --Video playback: 6 hours (using 3.5MM headphones) (lab data) --Memory expansion: Micro SD card (up to 128GB, format FAT32) --Music formats: MP4, WMA, OGG, APE, FLAC, WAV, AAC-LC, ACELP --Video formats: RM, RMVB, AVI, MKV, WMV, VOB, MOV, FLV, ASF, DAT, MP4, 3GP, MPG, MPEG --Picture format: JPG/BMP/PNG/GIF --Main Features: Photo, Video, Google, WiFi, Music, Video, Picture, Sound Recorder, Stopwatch, Alarm Clock --Product size: 105.7*62*11.4/123*70*11.4mm --Shell material: aluminum alloy --Product color: black Packing List: 1*MP3 player (Micro SD card not included) 1*Owner's Manual 1*Silicone protective case 1*3.5MM earphone 1*type-c data cable