About this item Bluetooth Audio Adapter: This Bluetooth transmitter receiver can add Bluetooth functionality to your device, allowing you to enjoy wireless audio on devices that previously did not support Bluetooth (such as TV/PC/gaming device/mp3/mp4, vintage stereo, home stereo, speakers, car stereo). You will be able to enjoy the convenience of the Bluetooth feature without the need to replace them. 2-In-1 Bluetooth Transmitter Receiver: In transmitter mode (Tx), the Bluetooth adapter is plugged into an audio source such as a TV/PC/MP3/MP4 player and transmits audio to Bluetooth headphones/speakers. In receiver mode (Rx), the Bluetooth audio adapter can receive audio from a phone/tablet and play music on a wired speaker/stereo. RCA & AUX to Bluetooth, TF Card Play: This Bluetooth audio transmitter receiver supports RCA (L/R) & 3.5mm (AUX) audio output and allows you to insert a TF card into the Bluetooth audio receiver (in receive mode), enabling you to turn on the speakers and let