Interphone's 3.5 MM Dual Stereo Bluetooth Transmitter (BTSplitter) is a Bluetooth® stereo transmitter that transmits music from your MP3 player, PC or other device with 3.5 mm stereo output jack. Music is transferred wirelessly to your Bluetooth® stereo receiver (headset). BTSplitter is the perfect product for sharing music between a motorcycle rider and passenger who are wearing an Interphone Bluetooth headset. It will stream the same audio source to both headsets simultaneously. BTSplitter has a built-in battery and can be used for around 9 hours of music streaming after a full charge.