【Fast and Accurate Detection】The carbon monoxide detector features a built-in advanced electrochemical CO sensor that provides high-precision alarms for fast and accurate detection of carbon monoxide levels. When the carbon monoxide concentration exceeds the specified value, an alarm signal of more than 85 decibels will be issued. To ensure complete protection, be sure to place one on each floor of your home and in each bedroom. 【Wide Adaptability】The carbon monoxide detector is suitable for all places where carbon monoxide can be produced, such as your kitchen, bedroom, bathroom, warehouse, hotel, car, parking lot, or barbecue area. The portable carbon monoxide detector is powered by 2 x 1.5V AAA batteries (not included), which is easy to use, one-button test/reset. 【LCD Digital Display & LED Indicators】The carbon monoxide detector has an LCD digital display that shows CO levels in real-time, allowing you to see any significant changes in CO levels, and can display battery life, prompting you to change batteries. The intuitive LED indicator can clearly inform the working status of the CO alarm: Green LED indicates normal operation, red LED indicates alarm status, and yellow LED indicates fault. 【Portable and Easy to Install】The carbon monoxide detector is easy to install without wiring. It can be mounted on any wall or ceiling, as well as in a car. This CO detector includes mounting brackets, screws, and anchors, and comes with 3M adhesive. It is not only an ideal carbon monoxide measurement device for home use but also a must-have for car or travel. 【Quality Assurance】All CO detectors have been rigorously tested and meet UL standards. If you have any questions about our CO detectors, please do not hesitate to contact us. (Note: When testing the detector, please do not blow the hole directly with gas.) Specifications: Item: Carbon Monoxide Detectors Battery power: 2*1.5VAAA battery (not included) Sensor: Electrochemical Working temperature: 0-70°C Working humidity: Relative humidity 10% - 95% Carbon monoxide gas detection concentration: 0~999PPM Alarm indication: LCD display, sound and light indications Alarm standard: When the carbon monoxide concentration is detected to exceed 30 ppm, the alarm screen will light up and the real-time concentration of carbon monoxide in the air will be displayed. When the concentration reaches 100 ppm, the detector will immediately emit an audible alarm of over 85 dB and flash a red LED light for alarm! Package includes: 1x Carbon Monoxide Alarm 1 x User Manual 2 x Screws 2 x Back adhesive