1) Type: popular earplug 2) Character: nice and popular, crystal clear sound 3) Shell Material: light metal 4) Driver unit: I|16mm 5) Impedance: 32Ic 6) Sensitivity: 106dB/mW 7) Rated power: 3mW 8) Frequency response: 20-20kHz 9) Inserter: stereo I|3.5mm 10) Normal Packaging: PP bag/PE bag 11) Excellent Packaging: Gift box