BT-21 NFC Bluetooth 5.0 Receiver & Transmitter RCA 3.5mm AUX Audio Adapter

1. Product interface: RCA interface / AUX audio interface2. Bluetooth version: Bluetooth 5.03. Connection range: 15m4. Battery capacity: 200mAh5. Work length: receive 8h / transmit 5h6. Frequency range: 10Hz-20HKz7. Signal-to-noise ratio: less than 110dB8. Product features: Bluetooth receiving / transmitting function combination9. Package: 1*Bluetooth adapter,1*Charging cable,1*Audio cable