Bluetooth Transmitter and Receiver,Catozon BTI 2-In-1 Wireless Bluetooth Audio Music Streaming Switchable Transmitter and Receiver With 3.5mm Stereo Output-Connect Your Iphone,MP3 Player To Speakers Catozon BTI 2-In-1 Bridges Your Bluetooth Device To Your Speakers Or Your Bluetooth Speakers To Your Audio Device. Simple one-button switch to shift between transmitter(TX) and receiver(RX) mode. TX Mode:Plug In To Your Non-Bluetooth Device And Pair Up Your Bluetooth Speaker Or Headset. RX Mode: Plug Into Your Non-Bluetooth Speaker And Pair Up Your Bluetooth Phone Or MP3 Player. Bluetooth-enable all 3.5mm media devices (enable Bluetooth receiving: speakers, headphones and more; enable Bluetooth transmission for: MP3, CD / DVD players, e-readers, TVs and more). Built in battery for portable use, or connect to a USB power source for always-on application. Ideal For Any Powered Speakers Or Devices Using Standard RCA Or 3.5mm Jack Or AD2P Bluetooth.