Sony MDRXB950AP/H Extra Bass Smartphone Headset Acoustic Bass Booster for incredible bass response, 40mm drivers for dynamic frequency response (3 - 28 kHz).Connectivity Technology: Wired In-line microphone for hands-free phone calling, Compatible with Apple or Android smartphones, Free SmartKey App for customized in-line remote function Comfortable around-the-ear design, Sophisticated aluminum, swivel design for portability, 47 1/4 in. (1.2m) tangle-free Y-type cord