Mpow Bluetooth 4.1 Receiver and Transmitter, 2-in-1 Wireless 3.5mm Audio Adapter, Pairing with 2 Bluetooth Headphones At Once In TX Mode, Built-in Mic for Hands-free Calling in RX Mode......Amazon has tons of those. Simple.....I plug it in via a short 3.5mm cord from the above to the rear of the bike. I also keep micro USB shorty plugged/charging full time as well. I keep the on/off switch on, on the transmitter. Even if the transmitter goes dry after few days, once you start the bike, it starts charging and the phone will pair no issue. When you first get it, you need to pair one time and you are done every time it is on with your phone. Please note in the photo on Amazon that the 3.5mm aluminum plug can come out off the transmitter. Most of these toys last many days with no charge needed. The charge is quick. So, the music is transfered via bluetooth from the phone through the AUX function on the bike. You need to choose AUX via the button on the left side panel on the bike and you are set. Any unit you buy work the same way. No need to worry about the MIC. I use it for music only. The minus is, when you get a call, You will not be able to use the phone unless you cancel the transmitter. The above is sitting inside the plastic pocket and I never see or touch it.