Sony XBA-300AP In-ear Balanced Armature Headphones High-Resolution Audio capability, 3.5mm Plug Triple Balanced Armature drivers (Full + Woofer + HD Super Tweeter) units 4-wire silver-coated OFC cable with L/R ground separation for a cross talk reduction Impedance: 16 at 1kHz Hands-free calls with in-line remote and microphone