1. What you get: Package includes 5 pieces of piezo buzzer. The buzzer with sound has a low voltage and low energy consumption and clear sound. With a loud and continuous signal tone of 95 dB at 12 V DC, the piezo buzzer is ideal as a good acoustic warning device. 2. quality material: Buzzer made of quality ABS material is practical and can be conveniently controlled. Inside there is a piezo element as well as driver circuits and electrical components. Intended for industrial use. 3. Easy to use: Alarm siren 12 V can work with DC 3 24 V, the rated voltage is 12 V. The buzzer is connected to the rated power and continues to sound, and the impedance adjuster controls the piezoelectric buzzer sound. Piezo buzzer with integrated structure, DC power supply and long service life. 4. design: The buzzer mainly consists of a multivibrator, a piezoelectric buzzer chip, an impedance adjustment unit, a resonator and a housing. Nominal voltage of 12V, 2 wired connectors, makes connection easier.