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Specification: Type: Electromagnetic Active Buzzer Material: ABS Dimension: 12x9.5mm Color: Black Rated Voltage: 5V Operating Voltage: 4-8V Rated Current (MAX): 30mA Min Sound Output At 10cm: 85 dB Resonant Frequency: 2300 +/- 300 Hz Pin Spacing: 7.6mm Package content: 12x Active buzzer continuous beep Features: All multi-chip integrated circuits using gold wire ball bonding, complex production process, long life, stable performance, high rate of qualified products. Uses:Active buzzer need only on the DC will beep,active buzzer internal oscillator!