B20 NFC Bluetooth 5.0 Music Receiver Car Bluetooth Receiver, Support Hands-free Call & TF Vard & U Disk 1. This is a home Bluetooth audio receiver with dual interface audio output, supports TF cardU disk playback, hands-free calling, and NFC connection. Industrial-grade power isolation module is used to solve noise interference 2. Connect your speakers (3.5mm and RCA) via the (3.5mm and RCA) audio interface, instantly turning your ordinary speakers into Bluetooth speakers. The product is compact and stylish in appearance and convenient to operate. Pairing with the product through Bluetooth devices (mobile phones, tablets, etc.) allows you to enjoy the music feast brought by Bluetooth transmission at any time 3. Support equipment: support two mobile phones to connect 4. Bluetooth version: 5.0 5. Output interface: 3.5mm stereo, RCA left and right channels 6. Function introduction: TFU disk playback, hands-free call, NFC connection 7. Bluetooth protocol: AVRCP, A2DP 8. Frequency range: 2400-2483.5MHz 9. Frequency response: 20Hz-20KHz 10 Output power: 28mW RL=16 ohm 11. Signal to noise ratio: greater than or equal to 90dB 12. Total harmonic distortion: less than or equal to 0.001 13. Support SBC, AAC 14. Forward transmission distance: 10m 15. Support Micro USB interface: 5V power supply