Conventional Sounder Strobe 1. Operating Voltage: 24VDC Range Acceptable: 15~28VDC 2. Power supply start current: ＜10.0mA 3. Sound Pressure Level: After starting, the sound changed from small to large, 3 to 5 seconds, 3 meters ahead 75～105dB 4. Flashing Frequency:1.0Hz～1.8Hz 5. Sound Pulsing Frequency: 2.5S～4.5S 6. Wiring: Connect to 24V power supply,power connect has polarity 7. Operating Environment:Temperature Range: – 10℃ ~ 50℃8. Relative Humidity: ≤ 95%RH non-condensing 9. Material of Enclosure and Color:Plastic,