Question about Ugreen CM403

The CM403 is a Bluetooth transmitter and receiver that is compatible with any Bluetooth-enabled device. To connect your JBL headphones to the NAD T757 amplifier, you can use the CM403 as a Bluetooth transmitter - it receives the signal from your headphones or sends audio from the amplifier wirelessly. The Ugreen jack plug is used for the cable connection between the components. This combination should work as long as your JBL headphones support Bluetooth.