Feature Oscillation Frequency KHz 2 7±0 3Operating Voltage Vdc 2 5 4Rated Voltage Vdc 3Current Consumption mA max 35at Rated VoltageSound Pressure Level dB min 83 at 10cm at Rated VoltageTone Pulse RateConstantOperating Temperature °C 20 70Storage Temperature °C 30 80Package included 10pcs 5V Active Alarm Buzzer