The DLO 007-0003 Headphone Splitter is customized to fit into the recessed headphone jack on iPhone, and the specialized blue port supports microphone functionality – so you can still take calls on your iPhone when using the Splitter. It features a 4-inch flexible cable, and is 6 inches in total length so you can share your music comfortably. The Headphone Splitter is also useful as an adapter when your iPhone case has an opening that's too small for your third-party headphone jack to fit through. • 1/8" (3.5mm) stereo minijack – also customized to fit iPhone • 6-inch total length, with 4-inch shielded, flexible cable • Headphone port for use with standard headphones • iPhone headset port supports microphone functionality – so you can still take iPhone calls • Compatible with any device with a standard headphone jack