Product is shipped according to the color or size of the main image on the product page. Lcd Co Carbon Monoxide Gas Alarm Sensor Poisoning Gas Tester smoke detector Human voice warning Detector for alarm system Features:LCD displays carbon monoxide gas concentration from 000-999PPM. Human voice prompt, when reaching the given alarm level, the detector will give out alarm and voice prompt. Adopting highly reliable and stable electrochemical sensor, effectively detect CO gas in real time and remind people. Low current consumption, ultra-long standby time.* Turn off your gas detector by pressing the test button immediately when gas is not urgent. Low battery warning. LCD displays LB and prompt voice attention please, low battery warning. Press the TEST/RESET button to display the alarm levels. When the detector is faulty, it will display ERR. Specifications: Power supply: 3*1.5V AAA batteries (not included) Sensor: Electrochemical carbon monoxide sensor Operating temperature: 0-50 Working humidity: 10%-95% relative humidity Detection concentration: 000 ~ 999 PPM Sensitivity level: 5 PPM Error: +/- 10% Concentration reading during normal operation: 000 PPM Concentration reading during alarm: 030 ~ 999 PPM Battery display: low battery alarm Installation matters 1. As a general rule, detectors should be installed in bedrooms, living areas, cars and other places where people stay for a long time. They are recommended to be installed in bedrooms, hallways, basements, cars and living areas. 2. Since the concentration of carbon monoxide in the gas is lighter than air, the detector should be installed 0.3-1 meter below the ceiling. A location within 1.5 meters of the gas source. Or put the alarm on the bedside table in the bedroom. This alarm can also be placed in the car to detect carbon monoxide leaks in the car. There are installation drawings, interior drawings and inside the car 3. When installing the detector, it is not easy to be too close to the stove to prevent the detector from being baked by the flame; it cannot be installed in places with high water vapor such as exhaust fans, doors and windows, and bathrooms; It also cannot be installed in places with large oil smoke. So as not to block the air inlet of the detector, so as to prevent gas from entering the detector, which will affect the sensitivity of the detector.