I wanted to know if it's possible to use 2 Bluetooth devices at the same time. I own a LG Tone Bluetooth Headset (not the Tone+). I am interested in buying a Bluetooth Heart Rate transmitter (possibly from Polar, but looking at other companies as well.) My concern was will I still be able to use my Headset for music and be able to use the HR unit at the same time or do I have to go to wired headphones when I use the HR unit? Thank you in advance.