1. Simple Operation, No Driver Required 2. Bluetooth 5.1 Receiver, Digital Optical Fiber Analog Audio Converter 3. Rich Interface, Multi-Functional, Strong Compatibility, Built-In Digital Signal Conversion Chip, Support Various Interface Equipment Connection 4. Support U Disk Playback, Driver-Free Plug And Play, Supported Formats: WAV. WMA. APE, FLAC. MP3, Etc. 5. Connect The 3.5mm Audio Or RAC Audio Interface, And The Audio Without Bluetooth Function Can Also Play Wirelessly Name: Bluetooth Receiver & Audio Converter Frequency Response Range: 10hz-20khz Signal-To-Noise Ratio: 110db Distortion + Noise: Less than 0.02% Bluetooth Version: 5.1 Effective Distance: 20m Performance: Hifi Level Support: A 2dp/Avrcp U Disk Support Format: WAV. WMA. APE, FLAC. MP3, Etc. Different batches may have differences in product appearance, color, and characters, which will not affect the use Colour:black Material:ABS+plastic Size:8.6 x 6 x 2.2cm Package Contents: 1 x Host 1 x Charging Cable 1 x Optical Cable 1 x 3.5mm Audio Cable 1 x RCA Audio 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.