HuiDeonne Carbon Monoxide Detector brings you a safe and reliable living environment! Material - Plastic Style-Wall-mountable Battery Powered-3xAA batteries(batteries not included) Alarm Indication-LCD display,sound and light tips Sensor-Electrochemical Working temperature-10C -55C Alarm->85dB CO gas detection concentration-0~999 PPM Working humidity-Relativehumidity?95%RH Product size-10*10*3.5cm/3.94*3.94*1.38inches Product weight-130g/0.287lb Package List 1x Carbon Monoxide Detector,2 x Expansion Screws ,2 x Anchor Plugs,1 x User Manual At HuiDeonne, we have a professional R&D team dedicated to designing and creating reliable home security products, making every home and business a safe place. Quick Detection Coverage Area When the CO concentration reaches a certain value, it will trigger: sound and red flashing alarm according to the concentration. Allows you to quickly and easily read and understand the current ambient CO concentration Alarm standard When the concentration of carbon monoxide is detected to be between 30ppm and 50ppm, the alarm screen will light up within 120 minutes and display the real-time concentration of carbon monoxide in the air. The detector will emit an alarm sound of over 85dB and flash the red LED light for alarm! When the concentration of carbon monoxide is detected to be between 50ppm and 99ppm, the alarm screen will light up within 60-90 minutes and display the real-time concentration of carbon monoxide in the air. The detector will emit an alarm sound of 85dB or more and flash the red LED light for alarm! When the concentration of carbon monoxide is detected to be between 100ppm and 299ppm, the alarm screen will light up within 10-40 minutes and display the real-time concentration of carbon monoxide in the air. The detector will emit an alarm sound of 85dB or more and flash the red LED light for alarm! When the concentration of carbon monoxide exceeds 300ppm, the alarm screen will light up within 3 minutes and display the real-time concentration of carbon monoxide in the air. The detector will emit an alarm sound of 85dB or more and flash the red LED light for alarm! Clear LCD Display Screen This carbon monoxide detector used at home can clearly display the real-time concentration of carbon monoxide (CO) in the ambient air. 4 LED Indicator Light Red-Alarm conditions Yellow-Fault conditions Yellow-Sensor life Green-Normal power conditions/Low battery reminder Flexible Installation This household travel carbon monoxide detector is wall mounted, and you can install it on the wall or ceiling. The portable and compact design makes it easy to carry while traveling. Warm Tip 1.When you receive the carbon monoxide alarm detector for the first time, please check the working status of the carbon monoxide detector: after installing the battery, the device will automatically turn on. When you press the test button, three seconds later, the green light will turn on and the red and yellow lights will start flashing! After 180 seconds, only the green LED flashes once every 60 seconds or so, indicating that the device is working properly. 2. It is highly recommended that the product be mounted on a ceiling or wall to ensure that carbon monoxide entering the inlet contacts the sensor successfully. 3. The CO detector is equipped with an alarm threshold, only when the concentration of carbon monoxide reaches a certain alarm value, the carbon monoxide detector will trigger the alarm. 4. Since grease and dust can block the inlet and thus prevent carbon monoxide from entering the detector, if the detector is installed in a kitchen or garage, we strongly recommend installing it away from cooking areas or dusty areas. Carbon monoxide is a tasteless and odorless gas. Using this carbon monoxide alarm detector can alert you to the harmful levels of carbon monoxide and keep your family safe!