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description of goods: Buzzer is an electronic sounder with integration structure. Using DC power, it is widely used on computers, printers, photocopiers, alarm, electronic toys, automotive electronic equipment, telephone, timer and other electronic products. Features: 1, Piezoelectric buzzer is mainly made up by multivibrator, piezoelectric buzzer chip, impedance matching unit, resonator and shell.2, Multivibrator is composed of transistors or integrated circuits. When switched on, multivibrator vibrates and outputs audio signal. 3, Impedance matcher drives piezoelectric buzzer sound.4, Connected to rated power and the buzzer will sound continuously.5, Can be controlled conveniently. Spezifikations: Model: 2312 Color: Black Diameter: 23mm Height: 12mm Cable Length: 100mm Sound Pressure Level: 85 to 95 decibels Rated Voltage: 12VDC Working Voltage Range: 3V-24V Max Current: 10mA Weight: 3g(approx.) Package includes: 1 x Buzzer Note: 1. Please allow 1-3mm error due to manual measurement. Thanks for your 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 standard.