Home Company Profile Factory Profile Our Products Contact Us News     Speaker Microphone Transducer Buzzer Plate Receiver                      LPB4020 Product Number LPB4020 Description With built-in oscillating circuit, Continuous Tone; Ø40x2.0(H)mm; Enquiry Send Enquiry Specification Resonant Frequency (Hz) 3200 ± 500 Rated Current (mA) ≦50 Operating Temperature Range (℃) -20 ~ +65 Storage Temperature Range (℃) -30 ~ +70 Rated Voltage ( V )D.C. 9 Operating Voltage ( V )D.C. 5~20 Sound Ouput at 30cm (dB) ≧105   Speaker Condenser Microphone Buzzer & Transducer Buzzer Plate Receiver Copyright 2004 by Union Team Limited (Group)