MB2 CSR Wireless Audio Adapter Bluetooth 5.0 Receiver & Transmitter 1. Bluetooth version: Bluetooth V5.0 2. Support protocol: RX (A2DPAVRCP), TX (A2DP) 3. Working frequency band: 2.402GHz -2.480GHz 4. Support dual stream (TX mode): support a transmitter to connect two Bluetooth speakers or earphones at the same time to use a CODEC at the same time, can support APTX LL 5. Support multi-point connection (RX mode): support to connect two mobile phones 6. Battery capacity: 500mAh 7. Charging current: about 350mA 8. Charging time: about 2.5 hours 9. Bluetooth distance: greater than 80m (unobstructed) 10. Charging method: Micro USB 5V0.5A 11. Inputoutput connection mode: RCA interface, I2S AUX interface, support RCA, AUX dual simultaneous output 12. Compatible: Android, IOS system mobile phone and PAD, and Bluetooth speakers or earphones supporting A2DP protocol to connect and use 13. Size: about 11x9x2.5cm 14. Weight: about 70g Features: 1. Exquisite appearance 2. Using CSR high-end chip design 3. One-key switch between RX and TX modes 4. RCA, I2S audio inputoutput interface, can be switched freely 5. Two antennas, the Bluetooth operating distance is greater than 80M, and the stability is strong 6. High fidelity lossless sound quality, ultra-low latency sound output, support apt-X LL, apt-X, SBC, AAC, FS 7. When the battery is less than 20%, there will be a low battery reminder. After 6 minutes in the RX, TX mode without connection, it will automatically enter the sleep power saving mode, and it has its own battery protection IC, which is safe and reliable while charging. 8. Support dual-stream (TX mode) transmission and connect two Bluetooth audio devices 9. Receive (RX) can be connected to two devices at the same time, any two of the mobile phonetabletnotebook device, and the volume and up and down songs can be controlled by the buttons during playback 10. Both receiving mode and transmitting mode can realize automatic return connection, and have memo