Hi-Res Audio to Tickle your Ears: FreeBuds 5i is Hi-Res Audio Wireless certificated, featuring a wider frequency response, full-link high-resolution sound
Sound unit: 12.4mm moving coil unit Horn sensitivity: 111±3dB@1KHz 179mV Microphone sensitivity: -38dBV/Pa (±1dB) Number of microphones: 2 pcs/single side