Home Company Profile Factory Profile Our Products Contact Us News     Speaker Microphone Transducer Buzzer Plate Receiver                      D-2 Product Number D-2 Description Enquiry Send Enquiry Specification Frequency : 70~15KHz Sensitiviey : -72dB±2dB ( 0dB = 1V/μ bar at 1KHz) Output impedance : 600Ω ± 10% Direcitvity : Uni-directional   Speaker Condenser Microphone Buzzer & Transducer Buzzer Plate Receiver Copyright 2004 by Union Team Limited (Group)