JLab J3MS JBuds In-Ear Single Earphone Style Headset with Enterprise Class Mic (Silver) (Discontinued by Manufacturer) Single (one) earbud handsfree wired headset with mic (different from J3M which has two earbuds) Push button control for answer calls / music control Rugged metal construction with durable flex joints Compatible with most smartphones with a 3.5mm jack Primarily designed for use with cell phones, two way radios, and other applications such as driving or biking, where only one bud is preferred to leave the other ear open