1) frequency response: 20hz-20 khz 2) speaker impedance: 32Ω 3) driver unit: 10mm 4) rated power: 2mw 5) power handling capability: 10 mw 6) cable length: 1.30 m 7) sensitivity: 100db 8) microphone: 4.5*2.2mm-42db+/-3db 9) plug: 3.5mm stereo 10)ear bud made in metal material 11)it can make very high quality sound 12)compatible with mp3, mp4, ipod, iphone laptop, computer and other audio device .With lifelike sound and outstanding bass response 13)PU/PVC rubber for earphone wire 14)OFC copper material in line 15)Weight: 15g (with wire)