Audio playback: Audio decoding supports: (MP1, MP2, MP3, WMA, OGG, APE, FLAC, WMV, AAC-LC, M4A formats) Variable speed playback: During audio playback, you can set playback speed as needed. The playback speed has nine levels of acceleration and deceleration to meet different audio playback needs. Recording: The format supports WAV; Bluetooth: Supports BT/5.2, can connect to mobile phones and headphones/speakers Call recording: You can connect recorder via mobile phone Bluetooth, and then answer call with your hand. The call content can be saved in recorder and cribed. This function is yet Settings: You can set language, screen brightness, time and date as needed. Power on/off password Support large-capacity TF cards, up to 512GB FAT format TF memory cards. Short twice in a row to switch between upper and lower songs. Return to submenu. After selecting upper and lower songs, you can also switch between upper and lower song options. In menu key playback mode, short is return key, and long is to return to main interface. In a folder, long the menu button to delete option button, select file and choose to delete or cancel. One-touch push and pull button, as long as device can operate normally in any environment, you can switch to recording mode. After reset, you can record and save. Product model: lation recorder Recording mode: noise reduction recording Recording format: MP3, WAV Memory card type: support memory card Audio and video decoding support: (MP1, MP2, MP3, WMA, OGG, APE, FLAC, WMV, AAC-LC, M4A) Type-C USB 1.1 universal interface (headphone line control/charging/data mission) Color:Black Material:Zinc alloy Package Contents: 1 * AI Voice Recorder 1 * USB C 1 * English instruction manual Only above package content, other products are not included. Note: Light reflection and different displays may cause color of item in pic