Ultimate Ears SuperFi 5vi Noise Isolating Earphones with Microphone (Discontinued by Manufacturer) Exclusive top fire armature speaker, which produces powerful & extended high definition sound Miniature high performance microphone for hands free phone calls In-line multi-function button answers & ends calls & controls music/video on iPhone (not included)In-line microphone Sensitivity - -40dBV/Pa, 1 kHz Speaker Input Sensitivity - 115 dB SPL/mW at 1 kHz Frequency Response - 15 Hz - 15 kHz