1、Receive+transmit 2 in 1 design, long press TX/RX to switch mode, easy to use, suitable for multiple devices. 2、For OLED screen displays 8 Bluetooth devices nearby, use the +/‑ button to select the bluetooth device to be paired, and press the multi‑function button to confirm. 3、Traditional audio is upgraded to Bluetooth audio by using the receiving mode/5MM audio cable connection. 4、For cars with AUX interface, use the receiving mode to upgrade the car audio to Bluetooth audio through the 5MM audio cable. 5、Built‑in for AEC anti‑echo and for ANC anti‑noise circuits to restore pure sound quality. 1 x Bluetooth 5.0 Transmitter Receiver1 x 3.5mm Audio Cable1 x Charging Cable1 x Manual Item Type: Bluetooth  5.0 Transmitter ReceiverMaterial: ABSColor: As Picture ShownWeight: Approx. 72.0g/ 2.5Bluetooth Version: 5.0+EDRProtocol: RX: A2DPP AVRCP TX: A2DPFrequency Range: 2.402GHz- 2.480GHzBattery Capacity: 3.7V 300MahInput Interface: 3.5MMOutput Interface: 3.5MMTransmission Distance: ≥10MSignal to Noise Ratio: 70dBFrequency Response Range: 100Hz-20KHzTransmit Function: 1. Long press the multi-function button to turn on, and long press TX/RX to switch to TX mode.Screen display: TX:LINEPlease searchVOL: 30Indicates that the device is working in transmit mode 2. Insert the audio cable into the AUX interface of the transmitter, and insert the other end of the audio cable into the 3.5MM audio output interface of the TV 3. A. Bluetooth audio receiving device (such as: Bluetooth headset, Bluetooth speaker, etc.) is turned on and adjusted to the pairing state (red and blue lights flash alternately)B. Double-click the pairing button of the transmitter to enter the Bluetooth search mode. After searching for the name of the device you want to pair, use the +- button to select, and then press the multi-function button to confirm the pairingReceiving Function:1 Long press the multi-function button to turn on, long press the TX/RX button to switch to RX mode, the screen will display: VOL: 302. Insert the 3.5mm audio cable into the 3.5mm audio port on the device, and plug the other end of the audio cable into the AUX port of the playback device (headphones, speakers, etc.) 3. Open the phone device-Bluetooth-search device: for YET-T5, and then pair, after the pairing is completed, the screen displays: phone name and VOL: 30