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WE ARE MANUFACTURERS OF ELECTRICAL AND ELECTRONIC PRODUCTS FOR AUTOMOBILES.WE NEED PIEZO BUZZER DISCS AND MICRO SPEAKERS FOR AUDIO ALARMS/INDICATORS IN 12 AND 24 V SYSTEMS.27 DIA, 3-CIRCUIT/CONTACT12 DIA MAGNETIC OR OTHER SPEAKERS.SOUND LEVEL DESIRED 1) ABOUT 80 dB , 2) MORE THAN 100 dB AT 1 METRE DISTANCE.SOUND FREQUENCY :ABOUT 1.8- 2kHzPLEASE QUOTE.PLEASE SUGGEST SUITABLE CIRCUIT. buzzer, piezo, disc PiezoCeramic Buzzer Disc