1,hotsell E2C earphone 2,In-ear phone 3,highest quality 4,provide OEM service Type: in-ear headphoneSpeaker diameter: Mini ΦmmSensitive:105 dB/mWFrequency:20-20000(Hz)Impedance:16(Ω) Plug:3.5(Φmm)Cord length:1.2m E2C earphone / headphones -- Hotsell earphone & headphone