The Seltech product of the month is an Electret Condenser Microphone (ECM) called MEO4015S-423C1033.
It is an omni-directional whose diameter is 4.0 mm and tickness is 1.5mm.

Specifications :

• Sensitivity Range : -42±3dB RL=2.2KΩ Vs=2.0VDC (1KHz 0dB=1V/Pa)
• Impedance : Max. 2.2KΩ 1KHz (RL=2.2KΩ)
• Frequency : 50-12000 Hz
• Current Consumption : Max.500μA RL=2.2KΩ Vs=2.0V (DC)
• Operation Voltage Range : 1.0V-10V (DC)
• Max. Sound Pressure Level : 115dB S.P.L
• S/N Ratio : > 58dB 1kHz,0dB=1V/Pa,A-weight
• Sensitivity Reduction : < 3dB
• Contact version : Solder pads