(7.6×7.6×3cm) Portable CO2 Detector, Indoor Air Quality Monitor with NDIR Sensor and LCD Screen, CO2 Monitor with Alarm for Home and Office

High-Precision Sensor This CO2 detector uses an advanced NDIR sensor, which detects carbon dioxide using infrared detection technology with high precision, strong anti-interference, and excellent stability. Dual Alarm Function This CO2 detector has CO2 indicator lights on its screen: green light for good concentration (400~699 ppm), yellow light for medium concentration (700~1499 ppm), and red light for dangerous concentration (1499~5000 ppm). When the detected CO2 concentration exceeds 1500 ppm, the device will sound an alarm to alert you. The CO2 alarm value is customizable. Portable and Durable This CO2 monitor is small, so you can take it anywhere and hang it with the included lanyard. This CO2 monitor comes with a built-in 1000mAh lithium battery that can be fully charged in 3 hours and last approximately 72 hours. Large LCD Screen: This portable CO2 detector features a large, easy-to-read, and visually appealing color LCD screen. If not used for 5 minutes, it automatically