【Fast and Accurate Detection】The carbon monoxide detector is 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 warning of over 85 decibels will sound. For complete protection, be sure to place one on each floor of your home and in each room. 【Wide Adaptability】The carbon monoxide detector is suitable for any location where carbon monoxide may 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 AAA 1.5V batteries (not included), making it easy to use with a single test/reset button. 【LCD Digital Display & LED Indicators】 The carbon monoxide detector features a digital LCD display that shows real-time CO levels, allowing you to see any significant changes in CO levels. It also displays the battery life, prompting