Storage media: TF card (up to 512GB) (not included) Working temperature: -20℃-85℃ Operating system support: Windows98/Window XP/VISTA/Window7/Window10 and above File system support: FAT32, ExFAT Screen size: 2.4 inches;Screen features: TFT/TRANSMISSIVE dot matrix screen 240RGB*320Dots Screen visible area: 36.72x48.96mm Buttons: capacitive touch buttons + mechanical buttons Transmission interface: Type C USB Interface transmission speed: High-speed USB2.0 (up to 20MB/s transmission) Headphone interface: Dual-channel audio output 3.5mm specification (supports three-section and four-section headphone heads) Bluetooth-Compatible version: Dual-mode 5.3 Microphone: Built-in dual capacitor microphone Built-in lithium battery: 3.7V 260mAh Battery life: about 38 hours in music screen saver mode Charging time: about 2 hours (tested with 5V/1000 mAh charger) Audio bit rate: MP3: bit rate 8Kbps-320Kbps Sampling rate 8KHz-48KHz APE: bit rate Fast/Normal compression (800Kbps-1000Kbps) Sampling rate 8KHz-48KHz WMA: bit rate 5kbps-384kbps Sampling rate 8KHz-48KHz FLAC: bit rate L0-L8 (1000Kbps-1200Kbps) Sampling rate 8KHz-48KHz Signal-to-noise ratio: 100db Total harmonic distortion: Less than 0.01% Headphone drive capability (DACLR): 32R 0.654Vrms 13mW 16R 0.654Vrms 26m Brightness adjustment level: 0-5 levels Screen saver time setting: 10s-60s/long light Speed change level: -9-+9 levels Product size: about 70x50x9mm/2.76x1.97x0.35inch Colour:black Material:ABS Package Contents: 1 * MP3 music player 1 * data cable