Question about Ugreen CM403

@Tiger1001: For receiving - the device is then plugged into the audio input of a device as a receiver. Audio-in is available on stereo systems and loudspeakers, among other things; more modern devices often have a jack connection there, and otherwise you need an adapter to cinch.

Device as transmitter:
Audio source via audio-out jack -> Ugreen as Bluetooth transmitter -> Bluetooth receiver like headphones

Device as receiver:
Audio source via Bluetooth -> Ugreen as Bluetooth receiver -> Audio-In via jack to e.g. stereo system

Device receives audio via Bluetooth

I plugged the device into my electric piano and was able to connect my Bluetooth headphones.
headphones. However, it had a lag in the sound of a little less than a second. It was therefore not suitable for playing the piano, as even the smallest delay in the sound makes playing quite difficult and unnatural. After that, I returned the device. I did not test other applications. LG Elia