Home Company Profile Factory Profile Our Products Contact Us News     Speaker Microphone Transducer Buzzer Plate Receiver                      D-999C Product Number D-999C Description Enquiry Send Enquiry Specification Frequency : 120~8KHz Sensitiviey : -68dB±3dB ( 0dB = 1V/μ bar at 1KHz) Output impedance : 600Ω ± 30% Direcitvity : Uni-Directional   Speaker Condenser Microphone Buzzer & Transducer Buzzer Plate Receiver Copyright 2004 by Union Team Limited (Group)