Feature: 1. Mainly composed of multivibrator, piezoelectric buzzer chip, impedance matching unit, resonator and shell 2. Multivibrator vibrates and outputs audio signal 3 .The impedance adapter drives the piezoelectric buzzer sound 4. Connected to rated power and the buzzer will sound continuously 5. Can be controlled easily Specification: Description: Buzzer is an electronic siren with integration structure. Using DC power, it is widely used in computers, printers, copiers, alarms, electronic toys, automotive electronic equipment, telephones, timers and other electronic products. Features: 1, the piezoelectric buzzer is mainly composed of a multivibrator, a piezoelectric buzzer chip, an impedance matching unit, a resonator and a shell. 2, the multivibrator is composed of transistors or integrated circuits. When turned on, the multivibrator vibrates and emits an audio signal. 3, the impedance matcher drives the sound of the piezoelectric buzzer. 4, connected to rated power and the buzzer will sound continuously. 5, can be controlled easily. Specifications: Model: 2312 Black color Diameter: 23mm Height: 12mm Cable length: 100mm Sound pressure level: 85-95 decibels Rated voltage: 12VDC Operating voltage range: 3V-24V Maximum current: 10mA Weight: 3g (approx.) Package includes: 1 Ring Note: 1. Please allow 1-3mm error due to manual measurement. Thank you compatible understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as the standard.