CenryKay DC 3-24V 3105A Active Piezo Sound Electronic Buzzer Alarm Continuous Sound Beep BlackPack of 6

Specifications: Product Type: Active ~ Piezoelectric Buzzer Working voltage: 3V~24V Subject diameter: 30mm Height: 15mm Center hole distance: 40mm Rated voltage: 20V The higher the voltage, the louder the sound, the voltage is 24V, the smaller is 3V Rated current: ?30mA Sound level voltage: ?90dB Resonant Frequency: 3000±500HZ Operating Temperature: -30+80? Package Includes: 6× SFM-27 DC 3-24V Electronic Buzzer Alarm Sounder