1) Type: in-ear type 2) Perform: highly accurate sound-reproduction, crystal clear sound, enhanced bass, noise-isolating 3) Shell material: light metal 4) Driver unit: I|15mm.6u 5) Impedance: 32Ic 6) Sensitivity: 108db/mw 7) Rated power: 3mw 8) Frequency response: 20-20kHz 9) Jack: stereo I|3.5mm or I|2.5mm 10) Normal packaging: PP bag and PE bag 11) Excellent packaging: gift box