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Basic info: Name: Active Piezo Buzzer Material: ABS Colour: Black Type: Intermittent Sound Working voltage: DC 3-24 Volt Rated voltage: DC 12 Volt Max rated current: 30 m Amp Mini sound output: 85 dB Response frequency: 3000 +/- 500 Operating temperature: -20 to 50 degrees Celsius Storage temperature: -30 to 80 degrees Celsius Module size: 50*18mm Feature: This mini electronic beeper support DC 3-24V power supply and produce intermittent high-decibel alarm sound up to 85dB. 50mm mounting hole spacing and 18mm thickness with 2-wire pigtails easy to connect. Just connect to to any power supply from 3 to 24 Volts. Complete drive circuit incorporated for direct operation from DC power source. Application: Widely used in the car modification, DIY electronics reminder projects or other area needs sound alarm. What is in the package: 2pcs black active piezo electronic alarm buzzer