Another great sounding set of earphones for 2015. The ROCK Mula earphones offer a superb sound, with a 9mm driver for tight crisp bass, solid mids and crystal clear highs. Their Aluminium alloy casing which comes in stunning gun metal silver offer a light weight comfortable listening experience weighing in at just 13 grams. Included on the Oxygen free cable is an In-Line microphone offering music control. Technical Spec. Speaker driver : 9mm Impedance : 16 Ohm Speaker Sensitivity : 93 db Microphone : Yes Cable Length : 1.2m Cable Connector : 3.5mm