2X per CSR8675 Bluetooth 5.0 Wireless Lossless Audio Stereo Ricevi ES9018 - K1N8
Plug the Bluetooth flash drive directly into the speaker USB port and connect the audio cable to the AUX port. Type?USB Bluetooth Adapter. In the first way the speaker does not have a USB interface.
The latest version has been upgraded to Bluetooth version 5.1 using the QCC5125 Bluetooth module. Truly lossless transmission. Impedance: The output standard RCA impedance is 47k and the headset can push 300ohm.