... Type: CO: electrochemical , Smoke: photoelectric, Heat:temperatur combined detector3 in 1 co detector GS590Power Supply: DC 9V battery ... operatedSensitivity Setting: Sensitivity to co: conforms to EN50291standardSensitivity to smoke: comply ... 25-85%R.H.Sensor Type: CO: electrochemical , Smoke: photoelectric, heat:temperature sensorBattery spec: DC 9V,Carbon ...