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