[Bluetooth Transmitter and Receiver] Bluetooth Repeater is designed to upgrade your old TV, speaker, or vintage stereo system.Blue Tooth Transmitter for TV In transmitter mode (TX), it allows your old TV or PC to transmit wireless audio signals to your Bluetooth headset or speaker. Blue Tooth Receiver In receiver mode (RX), it can receive your favorite music from your cellphone and through traditional wired speakers or stereo systems. [Practical TF Card & U Disk Slot]Bluetooth Stereo Adapter To eliminate the hassle of playing music from your phone, the Bluetooth adapter features a convenient plug-and-play TF card slot. Simply insert a TF card (not included) into the device and turn on the speaker to enjoy your music without any additional connections. [Key Control]Bluetooth Adapter for Old Receiver comes with easy-to-use key controls. The large knob allows you to adjust the volume directly, and a of the knob can pause playback without the need to operate on your cellphone. [Great