Combination Smoke and Carbon Monoxide Detector Alarm Digital Display for Travel Home Bedroom and Kitchen 9V Battery Operated

?Power supply: DC 9V battery, 6F22 ?Standby current: ?98uA ?Alarm current: ?75mA ?Alarm sound: ?85dB (1m) ?Sensor type: Photoelectric sensor & Electrochemical CO sensor ?Low battery warning: <7.6V ?Alarm sensitivity. CO alarm sensitivity & time: 70ppm, alarms within 60-180minutes; 150ppm, alarms within 10- 50minutes; 400ppm, alarms within 4-15minutes; 700ppm, alarms within 2-6minutes. ?Temperature range: 0°C~49°C (32°F~120°F) ?Humidity: ?95%RH (No icing or condensation)