【2-in-1 TX&RX ADAPTER】Transmitter mode: Enable a non-Bluetooth TV, PC, Projector, CD player, iPod, MP3 / MP4 into Bluetooth, make your devices wirelessly connect to Bluetooth headphones or speakers. Receiver mode: Perfect for home/vehicle streaming sound system, can be connected 2 devices simultaneously. | 【PLUG AND PLAY】No driver needed, easy to use. In TX mode, the red light is on; In TX mode, the blue light is on. Simply click the button to switch the transmitter/receiver mode. (If your device has RCA, no 3.5mm AUX, please insert the RCA male to 3.5mm Aux female to the device, then connect the RCA cable to 3.5mm cable) | 【USB Mode】If your non-Bluetooth audio system has a USB jack. You only need to plug our device into a USB jack of a non-Bluetooth audio system. Gently press and hold the function key of the USB Bluetooth transmitter adapter, you can easily switch between transmitter mode or receiver mode (red light is transmitter mode, blue light is receiver mode). Plug and play, no need to install the driver, no need any auxiliary cable, Let you easily enjoy wireless music | 【AUX Mode】If your non-Bluetooth audio system does not have a USB jack. You can use the included AUX cord to plug into the aux jack of the device. Then plug the device's USB into your USB-powered device (such as a car charger/wall charger / mobile power supply) to power the device. Gently press and hold the function key of the device to easily switch the mode of the device (red light is transmitter mode, blue light is receiver mode). Let your device have wireless Bluetooth function immediately | 【Broad compatibility】Our Bluetooth audio transmitter is compatible with most audio equipment on the market. Transmitter mode: You can pair TV, computer, projector, and other devices to stream audio to Bluetooth headset, home stereo, etc. In receiver mode: you can transfer music from Bluetooth-enabled devices (such as iPhone, iPod, iPad, tablet, and other smartphones) to the car and home stereo system.