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
Another commenter said that at first you might think this is broken because one side doesn't work, and to be patient and put the plug in tighter. I'm glad that worked for him, and it worked for me at first, but after it was too late to return it, my left side went out and nothing would bring it back. I suspect this is a generic problem with this item and that's why the price is what it is. Do NOT buy this thing, you will be sorry.