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Lightweight and inconspicuous the Blue Piston tuneFRĒQS Duo BT high performance in-ear headphones, go virtually unnoticed around the neck, while delivering powerful audio for up to four hours at a time. Their dual-driver design allows for music to play at a higher quality than traditional earbuds, and give off a rich sounding bass. With Bluetooth 4.1 technology, these headphones will be your ultimate sound companion at home, and on-the-go! The in-line mic allows you to take hands free calls, and buttons on the cable allow you to control your music. Also included are three sets of ear tips for noise-isolating seal.