GSI Quality Waterproof Bluetooth Intercom System for Motorcycles/Motorbikes - Connect Up to 4 Riders At Max Distance - 2-Way Radio Helmet Headset - Connects to Bluetooth Mobile Phones and MP3 Players - Wireless Remote Control
I bought three of these to use with my boys while on our ATVs.  I spent about 4 hours getting them into the helmets, which would be fine - IF THEY WORKED.  I tried every combination to rule out a bad unit.  These things didn't work at all.  I did get the Bluetooth function to work- but it did not play the music from my iPhone.  It would play it in spurts, and each spurt would be about three times as fast as the unit caught up to the music.  Music - Fail.  Intercom- fail.  I tried every combination of the in