Alarm Buzzer Length of Wire: 10cm /4.0in Diameter: 3cm /1.2in Rated Voltage: 12V Range of Voltage: 3-24V Rated Current: 15mA at 12VDC Sound Pressure Frequency: 80dB at 12VDC /30cm Resonant Frequency: 2.5±0.5KHZ Operating Temperature: -20+45℃ Storage Temperature: -20+60℃ Package Includes: 6× SFM-27 DC 3-24V Electronic Buzzer Alarm Sounder