The Portronics Conch 50 in-Ear Wired Earphone with Mic, 3.5mm Audio Jack(Black) is a well-built, stylish and comfortable headset with a number of features to make your listening experience better. The Conch 50 features 50mm large-aperture drivers with an impedance of 16 ohms and a sensitivity of 98dB. The product also has a built-in microphone and inline volume control.