The Altec Lansing Behind the Ear Sport Bluetooth Earphones feature an active design to wear during any workout. Built with 15mm drivers, up to 4 hour battery life and 30 ft wireless range, never leave these at home when you're hitting the gym! Designed with you in mind, these earphones come equipped with three different sized eartips for ultimate comfort during any workout. With a built-in microphone and song navigation/telephony buttons, control your music how you'd like and never miss that important call.