Piezo Buzzer.
Sound Pressure Level: 90dB.
Buzzer Operating Voltage: 3.0V - 16.0V DC.
Buzzer Current: 15.0mA
Buzzer Frequency: 3.3Hz.
Dimensions (approx.): 33mm (l) x 22mm (w) x 10mm (h).
Mounting hold centres: 30mm (screws not supplied).