Universal USB Portable Bluetooth 5.0 Wireless Audio Transmitter Receiver 2 in 1 Adapter Item Type: Receiver/Transmitter Model: BT600 Technology: BT5.0, AVRCP (receiver mode only), A2DP Operating Range: Maximum 10m /33ft (no obstructions) Pairing Name (receiving mode): BT600 Transmitter Mode: Red LED light on Receiver Mode: Blue LED light on Instructions: 1. Mode switching: A. First plug the product into the USB interface of the 5V output. B. The default working mode after power-on is the transmitter mode. C. Press and hold the side button of the product for more than 3 seconds to switch to the receiver mode, and then press and hold to switch back to the transmitter mode. 2. Pairing and operation methods A. Receiver mode: The blue LED flashes to indicate that it has switched to receive mode. The USB of this product is used for power supply, and can be plugged into any USB interface with 5V output, such as mobile phone charger, mobile power supply and so on. Find BT600 in the Bluetooth settings of your phone. The blue LED is always on after the pairing is successful. Play audio files in your phone, use 3.5mm audio cable to connect to speakers, car audio Aux port and ordinary Bluetooth headsets. B. Transmitter mode: The red LED flashes to indicate that it has switched to transmitter mode. The USB of the product is used for power supply and can be plugged into any USB interface with 5V output. In the transmitter mode, the product will automatically search for other Bluetooth receiving devices that have been turned on (such as Bluetooth headset, Bluetooth speaker, Bluetooth receiver, etc.). The red LED is always on after the pairing is successful. Use a 3.5mm audio cable to connect to a device with audio output such as a TV or computer. At this time, the sound output by the device is wirelessly transmitted through the product to a receiving device such as a Bluetooth speaker or a Bluetooth headset.