Just saw a
Bluetooth Receiver Transmitter Adapter, I just confused , how doed it work?
this device seems have cables as well as bluetooth, Then How can it connect the speaker and the bluetooth earphones.
Looks like you can use it as either a transmitter or a receiver, so in transmitter mode the cables would let you connect a non-Bluetooth source component, such as a CD player or personal music player or whatever, and then send the signal to a Bluetooth-equipped system or receiver.
Or you could use the transmitter to send the signal from that source or even the tape or headphone output on a system to a pair of Bluetooth headphones, or a remote Bluetooth speaker system.
In receiver mode, it would let you send sound from a Bluetooth device such as a mobile phone or computer to a standard amplifier or system, by plugging the receiver's output into a spare input on the amp or system.
Or I guess you could even use one unit in tranmsitter mode and another in receiver to send sound between two systems in two different rooms.