bluetooth

So one of our schools called today and said they were having problems connecting to the sound system in the gym via Bluetooth. Apparently someone bought this little gadget that can sync to a phone and puts out a line level signal that they plugged into the stereo input on the sound board...

This isn't exactly theater/stage related, but it is pro-audio related, so I am thinking perhaps the geniuses of this forum might have some suggestions.I am looking for a way to record video with an iPhone, but for the audio, using high-end pro-audio lavalier or headset microphones (Countryman...