Features: High reliability sensor to help you detect gas density, it can detect precise scope.Made of premium materials, safe and stable. It's durable for long time use.Sensitive and effective alarm function can decrease the phenomenon of false alarm.Low current consumption, ultra-long standy time, alarm memory function, low battery prompt, auto detect sensor failure.No radiation, it causes no harm for people who come close to it. Easy to install and operate.Quick reaction to save your family from the silent killer carbon monoxide.Detection of natural gas, liquefied petroleum gas, improve home kitchen security.Specification:Condition: 100% NewMaterial: PlasticColor: As Picture ShownSize: 12.5 * 7 * 4cm / 4.9 * 2.7 * 1.6inPower: DC9V batterySensitivity / Alarm Time: Alarm Standard: UL (UL 2034)70PPM, 60 to 180 minutes150PPM, 10 to 50 minutes400PPM, within 4-15 minutes700PPM, within 2-6 minutesAlarm standard: EN (EN 50291)50PPM, 60 to 90 minutes100PPM, 10 to 40 minutes300PPM, within 3 minutes400PPM, immediatelyAlarm standard: CNCO concentration exceeds 150PPM within 5 secondsQuiescent current: <80uA (200uA when the LCD indicator is on)Alarm current: <30mAWorking environment: 0-50 CAmbient humidity: 10~95% R.HAlarm output: voice and red LED flashing alarmStatic output: green LED flashes every 30 secondsDetection level range: 000~999ppmSensitivity level: 5ppmError: +/- 10%Normal working condition: 000ppmAlarm concentration: 030-999ppmLow battery warning: Sound "Please note, low battery warning", battery signal flashing (Battery is not included)Package Weight: Approx. 157g / 5.5ozPackage Included:1 * Alarm1 * InstructionsNote:1. Please allow 0.2 inch error due to manual measurement, thanks for your understanding.2. Battery is not included.