Cafetec Full Metal Jacket (Discontinued by Manufacturer) In-Line Mic for iPhone, Blackberry and any phone with 3.5 jack and with control switch (Play/Pause/Track control) Speaker diameter: 11mm Magnet type NdFeB Frequency response 18-20K Hz, impedance: 16 ohms Max input power: 500mW In-line mic for iPhone, Blackberry and other 3.5mm-plug smartphones 11mm drivers with neodymium magnets for full-range sound In-line buttons for music play/pause/track control Comes with three separate sizes of silicone eartips (Small, Medium, and Large) Lifetime limited manufacturer's warranty