AERIAL7 Sound Disk Beanie Perisher Black w/Built-in headphones and microphone for use with iPhone, BlackBerry 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. Thin cable to decrease bulk, weight and downward pull on headphone. 3.5mm iPhone - 3.5mm standard