The integrated microphone and multifunction control button make the MDREX15AP the perfect companion for your smartphone. Android™ users can also enjoy the convenient Smart Key app for added control functionality directly from their smartphone. The 9 mm driver units deliver powerful bass while the hybrid silicone earbuds ensure a secure fit. The included Y-type cord with cord-slider prevents tangles on the go. Small, medium and large earbuds are included to fine tune your fit.