The buzzer vibrates through the multivibrator and emits audio signals. GOOD PERFORMANCE: This sound buzzer is mainly composed of a multivibrator, a piezoelectric buzzer chip, a impedance matching unit, resonator and enclosure, which have stable performance and durability. MAIN FUNCTION: This buzzer can be connected to rated power source and the buzzer will continue to sound. Can be easily controlled. IMPEDANCE ADAPTER: The 12v buzzer is designed with an impedance adapter to drive the sound of the piezoelectric buzzer. Important Parameters: It is a piezoelectric buzzer, sound type is continuous sound, volume is 85-95 decibels, working voltage is DC 3-24V. The cable length is 100 mm. Buzzer is an electronic probe with integration structure. The use of direct current is widely used in computers, printers, photocopiers, alarms, electronic toys, automotive electronic equipment, telephones, timers and other electronic products. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store