AERIAL7 Sound Disk Beanie Mammoth Antique Off White w/ Built-in headphones and microphone for use with iPhone&reg;, BlackBerry&reg; and Other Mobile Phones Beanie is designed for the perfect knit hat fit. Built-in microphone for use with iPhone, BlackBerry, other cell phones and Skype. Engineered to deliver the highest-quality listening experience from your Apple iPod, iPhone, BlackBerry, or other mp3 player, cell phone or music device. Ultra-slim speaker designed for comfort without sacrificing your music experience. 3.5mm iPhone - 3.5mm standard