AUX, 50mm drive diameter 32Ω is the impedance. Sensitivity: +/- 3dBF 106dB/mW Range of frequencies: 20 Hz–20 KHz 60 mm is the micro diameter. Sensitivity at minimum: -38dB +/- 3dBM Range of micro frequencies: 100 Hz–16 kHz USB + X3.5mm jack or USD + 2X3.5mm jack for headphones