Features 1. Bluetooth version: Bluetooth 5.1 (compatible Bluetooth 5.0/4.5/4.1/4.0…) 2. Support portcol: RX: A2DP/AVRC,TX: A2DP 3. Frequency range: 2400-2483.5MHz 4. Sensitivity: -81dBm<0.1%BER 5. Transmission distance: Barrier-free about 15m 6. Frequency response: 20Hz-20KHz 7. Signal-to-noise ratio: ≧75db 8. Audio Performance: SBC AAC decode 9. Interface type: USB port,TF card slot,AUX in/out, RCA R/L out,Coaxial in,MIC in 10. Basic function: Bluetooth receiver/Bluetooth transmitter 11. Use method: Plug and play 12. Support equipmect: Mobile phone/tablet/PC/TV/speaker/amplifier/headset/projector/Mixers and other equipment with audio input/output interfaces 13. Power supply mode: Type-C interface 14. Input parameters: DC 5V⎓1000mA (max) 15. Battery capacity: 3.7V/800mAh 2.96Wh.