Home Company Profile Factory Profile Our Products Contact Us News     Speaker Microphone Transducer Buzzer Plate Receiver                      SMB SERIES Product Number SMB SERIES Description Enquiry Send Enquiry Specification Rated Voltage ( V ) 3 ; 4.5 ; 6 ; 9 ; 12 ; 24 Operating Voltage ( V ) 2.5-4 ; 4-5 ; 5-7 ; 7-10 ; 10-14 ; 20-26 Rated Current (mA) 30 Sound Ouput at 30cm (dB) 75 Resonant Frequency (KHz) 0.3 - 0.5 Operating Temperature Range (℃) -20 ~ +70 Weight 9.5g   Speaker Condenser Microphone Buzzer & Transducer Buzzer Plate Receiver Copyright 2004 by Union Team Limited (Group)