Microphono 3B
Transistorized Microphone Sensitivity: -23 db (0 db= 1 volt per microbar), when operating below compression level Output Impedance: ohms Amplifier Voltage Gain: 0 to 33 db, adjustable Temperature Range: -30° C to+ 65° C Battery Drain: 1.2 ma. Battery Life: Approx. 6 months, based on average usage Battery Type: Burgess 2U6, Eveready 216, Ray-o-vac , or RCA VS-312. Finish: Light silver grey, baked enamel Weight: 2 lbs. less cable. Shipping weight 4 lbs. Cable: 3 conductor, 1 shielded, coiled cord with black PVC jacket Switching: Adapts to either "electronic" switching or on-off relay switching. White lead is signal lead and wrap shield is cable and microphone ground.