[4 in 1 Receiver Transmitter] Using upgraded Bluetooth 5.0 technology, the connection is more stable. [In TX mode], connect the Bluetooth transmitter to the audio output device, so that the sound played in the audio source device can be transmitted wirelessly through the product to the connected Bluetooth device for playback. [In RX mode], connect the product to the playback device (. You can wirelessly receive the audio played on the connected mobile phone through the product. [Quick link and re-pairing and dual link]Using the latest Bluetooth 5.0 technology, you can quickly connect to one or two wireless devices in a short time. Conveniently, it can automatically connect to the last paired device after booting. In addition, the transceiver has good compatibility with most Bluetooth-enabled smartphones. Product name: Bluetooth adapter Product model: T19 Voltage: 15v Bluetooth version: 5.0 Transmission distance: 15m Input interface: 3.5mm Size: 65.9x47.9x13.3mm Material:ABS colour:Black Package Contents: 1 x Bluetooth transmitter Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.