Type: Electret
Frequency Range: 300 - 5000 Hz                  
Sensitivity: 800 mV ± dB for 118 dB re 20u
Impedance: 50 Ω @ 1 kHz   
Power: according test circuit 
Current Drain: 8 mA @ 8 VDC, or  25 mA @ 16 VDC
Weight: 6 grams