Built-in mic for walk & talk hands-free calling.The ear hook design makes these ideal for use during sports activities, as the earphones are more secured. Never miss a beat.Compatible with most audio enabled devices with a 3.5mm audio input.Comes with an included Running Pouch to keep your music source safe and secure as an arm-band.Having music while you are doing your activities helps to keep your cadence correct and reinforces the 'effort/relax' aspect of ideal running.