Externally driven magnetic buzzers,Top sound Resonance Frequency: 2.4KHz Operating Voltage: 1~16 V0-p Rated Voltage: 1.5~12 V0-p Current Consumption: 40mA Max.at Rated Voltage Sound Pressure Leve: 85dB Min at Rated Voltage at 10cm Operating Temp: -40℃ ~ +85℃ Weight: 2.0g Housing Material: NORYL Lead Pin Material: Red Copper (DSn)