Brand name(s) : Mode Electronics

Packaged/Carded
ELECTRET MICROPHONE
Omni-directional electret cartridge.
Impedance:  same as load resistor (RL)
Sensitivity:  -69db (Vcc=4.5V RL=1KW)
Freq. response:  50Hz ~ 13KHz
Input voltage:  .5V ~ 10V (Typ. 4.5V)
Current:  .6mA maximum
S/N ratio:  over 40db