Plantronics 35BAA Universal Adapter from 3.5mm to Bluetooth. 35BAA Universal Adapter. HOW TO PAIR OR CONNECT THE PLANTRONICS 590A BLUETOOTH HEADSET TO THE UNIVERSAL ADAPTER. Power universal adapter on.
Product is the only one I use to take calls over the internet on my cordless phone. I also use it for my cellphone calls. I have listened to music on it as well and the sound is fantastic.