Mcdodo HP 2800 Series Lightning port high quality audio processing unit driver are made with high diaphragm for excellent sound performance aluminium alloy CNC process Smart microphone with control button for free switching between music and call function Speaker diameter 14mm Sensitivity 100dB +-3dB Impedance 42ohm Frequency 20Hz-20Khz Mic 42+-3dB Max power 20mW Cable length 1.2m Connector lightning Material aluminium alloy / ABS / TPE