1. Product model: B21 2. Supported devices: Two mobile phones can be connected 3. Output interface: 3.5mm stereo RCA left and right sound channel 4. Function description: U disk, hands-free call, 5. Bluetooth protocol: AVRCP, A2DP 6. Frequency range: 2400-2483.5MHz 7. Frequency response: 20Hz-20khz 8 output power: 28mW RL=16Ω 9. SNR: >90dB 10. Total harmonic distortion: <0.1% 11. Supports SBC and AAC 12. Forward transmission distance: 10 meters 13. Support Micro USB port 5V power supply
