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Piezo active buzzer directly connected to the DC power supply can work, the advantage is high sound pressure, high sensitivity, power consumption, generally in 20ma below, not more than 100ma, good reliability, low power consumption, no circuit.It is mainly used in security, air conditioning, refrigerator, instrumentation, reversing radar, microwave oven , printer, copier, alarm, electronic toys, automotive electronics, telephones, timers, Audio Ausrüstung, Autos, Supermarkt -Gating und andere elektronische Produkte. Die monatliche Versorgung mit 5 Millionen Summer, wir haben die Zertifizierung von TS, IATF.