XDU Stereo-to-mono Noise Isolating Earphone with Microphone - Fabric-reinforced Cord Single earphone allows you to maintain alertness in any environment Includes 3 sizes of rubber ear tips, to find your best fit 4 Conductor Gold-plated Stereo 3.5mm plug (same as 1/8-inch size plug) 42 inch long fabric-reinforced cord Stereo-to-mono circuitry mixes left and right stereo channels together into one earpiece