Description: High Quality Material: The 3-24V DC Electronic Buzzer is made of high quality plastic, which is durable and can effectively extend the use time.High Quality: This SFM-27 Active Piezo Buzzer consists of five parts, which are a multivibrator, impedance matching unit, resonator, chip buzzer chip, and shell.Sound pressure level: Rated voltage: 12V voltage, when the rated current: 12VDC, the sound pressure is 15mA Sound pressure frequency: 12VDC / 30cm is 100dB.Sound Reminder: After the Buzzer Alarm receives the signal, it will continue to occur and ring continuously.Application: Sounder Alarm is widely used in computers, motorcycle electronic equipment, printers, computers, etc. as sounding devices. Specification: Resonant frequency: 2.50.5KHZWorking temperature: -20 + 45CStorage temperature: -20 + 60C Size Chart: Length 11cm/4.33inchDiameter 3cm/1.18inch Package Includes: 5 SFM-27 DC 3-24VElectronic Buzzer Note: Please allow slightly errors due to manual measurement and different monitors.