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KY-012 Active Piezo Buzzer Speaker Alarm Module Breakout Board for Arduino consists of an active piezoelectric buzzer, it generates the sound of aproximately 2.5 kHz when the signal is high These small KY-012 Active Buzzers are widely used in computers, printers, copiers, alarms, electronic toys, automobile electronic equipment, telephones, timers and other electronic products as sound devices Operating Voltage of the KY-012 Active Piezo Buzzer Speaker Alarm Module Breakout Board for Arduino is 3.5 V ~ 5.5 V KY-012 Active Piezo Buzzer Speaker Alarm Module Breakout Board for Arduino is made from high quality PCB material and is durable for use Working Current: