This device uses non-dispersive infrared (NDIR) technology for high measurement accuracy, fast response, and a resolution of up to 1 ppm, capable of accurately detecting carbon dioxide (CO2) levels in the air within a range of 400 to 5000 ppm. The high-definition LED screen allows for quick and convenient data reading. Four color-coded bars on the display indicate CO2 concentration levels: green indicates healthy air quality, while red indicates potentially hazardous levels, enabling fast assessment of indoor air conditions. For optimal performance, allow the CO2 sensor to stabilize at the vent for 5 to 10 minutes before initial use, and permit up to 35 seconds for the device to detect changes in air quality. An ble alarm activates at 120 dB when CO2 levels exceed 1,200 ppm, signaling the need to open windows for ventilation or evacuate if necessary. Exposure to CO2 levels above 1,000 ppm may cause discomfort and reduce concentration and productivity. The device provides real-time alerts in crowded environments to help maintain a safe and healthy atmosphere. Designed with a compact and sleek appearance, the unit measures 2.87 x 2.87 x 0.71 inches, making it portable and easy to carry. A built-in 1000 mAh rechargeable battery supports up to 8 hours of continuous operation, enabling air quality monitoring on the go. The monitor supports USB charging and includes a low battery indicator. This portable CO2 monitor is suitable for use in grow rooms, travel, camping, RVs, vehicles, hotels, parties, wine cellars, kitchens, bedrooms, offices, schools, agricultural settings, and other indoor environments. Color: White Material: Plastic + Metal Package Contents: 1 x Portable CO2 Monitor 1 x Charging Cable Note: Light reflection and differences in display screens may cause slight variations between the product color shown and the actual item. Measurement error tolerance is +/- 1-3 cm.