Nocs NS400-001 NS400 Earphones with Remote and Mic (Titanium - Black) (Discontinued by Manufacturer) Speaker: 8.6 mm dynamic. Sensitivity: 95 dB SPL @ 1 kHz. Impedance: 16 Ohm @ 1 kHz . Extra sleeves (S, M, L). Frequency: 20 Hz 20 kHz .