if you choose the with backlight version  , long press the button to turn on the back light .

Display screen: 3.52 inches, 240 * 360

Bluetooth version: Bluetooth 5.3

TF card expansion: ≤ 128GB (FAT32 format)

Audio formats: MP3/FL AC/AAC/WAV/APE/WMA, etc

Recording format: MP3, WAV

EBook format: TXT

Battery capacity: 850mAh/3.7V lithium battery

Product weight: approximately 88g

Charging interface: Type-C interface