Features:
Widely use in computers, printers, copiers, alarms, electronic toys, automotive electronic equipment, telephones, timers and other electronic products for sound devices.
It made of oscillator, the electromagnetic coils, magnets, diaphragm and housing and other components.
After powered on, the audio signal generated by the oscillator current through the solenoid coil, the electromagnetic coil generates a magnetic field. Entangled in the diaphragm and the magnet solenoid

Specifications:
Voltage: 3V
Current: less than 35mA
Frequency: 2300Hz(around)
Diameter: 12mm
Thickness 9.6mm
Color: Black

Package includes:
20 x Piezo Buzzer