Model Number: 9DG010-#3446 Key Specifications/Special Features: Specifications:Item: Smoke detectorSensor: OpticalOperating voltage: DC 9V batteryStandby current: ≤10uAAlarm current: ≤12mAOperating temperatures:-10°c ~+60°cOperating humidity:≤ 95%RHDetecting area: 60 square meterAlarm sound: ≥85dB(3m)Alarm output: relay output N.C/N.O. optionalSensitivity: adjustable