Smoke Alarms 1-Ionization Sensor 2-EN14604 alarm 3-9V battery Operated with LED flash 4-Low Battery signal 1.Size:Φ142X52mm2.Battery: DC 9V3.Alarm Sound: ≥85dB 4.Static current: ≤10uA4.Alarm current: ≤10mA5.Low voltage alarm: 6.8V6.Working temperature: -10 - +50°C7.Working humidity: 95%RH8.Low battery alert remains10 - 15 days9.Sensor: Ionization