Lectret 5140 Microphone

• Mic Sensitivity : 0-6 dBm/uBar (-60 to -54 dBV/uBar)
• Mic Impedance : 2-6 Kohms

Earphone P-206 with Acoustic Tube

• Earphone Sensitivity: 115 ± 6 dBSPL/1 mW at 1 KHz
• Earphone DC resistance: 74 ± 5 ohms
• Earphone AC Impedance: 220 ohms ± 30% at 1 KHz