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
