1) Type: in-ear type plug 2) Perform: highly accurate sound-reproduction, crystal clear sound, enhanced bass, noise-isolating 3) Shell material: light metal 4) Driver unit: 10mm 5) Impedance: 32 6) Sensitivity: 108dB/mW 7) Rated power: 3mW 8) Frequency response: 20-20kHz 9) Jack: stereo 3.5mm or 2.5mm 10) Normal packaging: PP bag and PE bag 11) Excellent packaging: gift box