B21 AUX Bluetooth Audio Adapter Bluetooth 5.0 Receiver Transmitter

1. Chip: CSR86752. Bluetooth version: Bluetooth V5.03. Supported protocols: RX: A2DP AVRCP TX: A2DP4. Working frequency band: 2.402GHz -2.480GHz5. Power level: power level 1 (Class I)6. Sensitivity: -80dBm7. Signal-to-noise ratio: above 75dB8. Codec: TX: apt-X HD, apt-X LL, apt-X, SBC; RX: apt-X HD, apt-X LL, apt-X, SBC9. Built-in battery: 1000MAH10. Charging current: about 200MA11. Charging time: about 4.5 hours12. Battery life: RX is greater than 20H, TX is about 15H on average13. Bluetooth distance: greater than 80M (straight line without obstruction)14. Charging method: Micro USB 5V/0.5A15. Input/output connection: SPDIF interface, I2S AUX interface16. Compatible: Android, IOS system mobile phones and PAD, and Bluetooth speakers or headphones that support A2DP protocol are connected to use17. Support dual stream (TX mode)18. Support one yovda transmitter to connect two bluetooth speakers or headphones at the same time and use one CODEC at the