Main control chip: 32bit dual-core Bluetooth protocol: LC3/AAC/, etc. Bluetooth version: version 5.3 (backward compatible with versions 5.1/5.0/4.2, etc.) Bluetooth transmission distance: within 20 meters U disk/TF card playback format: WAV/FLAC/APE/WMV/MP3/M4A/AIF, etc. U disk/TF card playback file system support: exFAT/FAT32/FAT Sampling rate supported: 44.1khz/48khz/96khz Bit width supported: 16bit/24bit Signal-to-noise ratio SNR: 104dB Input interface: USB+TF card+Bluetooth Output interface: lotus head+3.5mm headphone jack, the interface outputs sound at the same time Power-off memory: can remember the last played song, input mode, volume, etc. Power supply: DC 5V/0.5A Note: The remote control does not come with 2 x AAA batteries, you need to prepare them yourself colour: Black material: ABS Package Contents: 1 x Bluetooth player 1 x charging cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.