Features 1、[Multifunctional CO2 Monitor] Capable of detecting CO2 levels from 400 to 5000ppm and sampling every 1.5 seconds, this CO2 monitor offers highly accurate real time data and also monitors temperature and humidity. 2、[Clear Display Screen] The CO2 temperature humidity monitor features a clear, easy to read display with adjustable brightness, allowing for effortless reading of values in various lighting conditions. 3、[Alert System] Equipped with an alarm, the CO2 detector alerts you when ppm levels rise, the notification can be turned off. The monitor can be calibrated over time to maintain accuracy. 4、[Rechargeable Battery] This portable air quality meter is equipped with a 1600mAh rechargeable battery. A 2 hour charging ensures up to 24 hours of use, supporting continued monitoring. 5、[Stable and Portable] The CO2 monitor thermometer hygrometer can be stably placed on desktop. Its lightweight and portable design make it suitable for homes, offices, classrooms, and other spaces. Specification Item Type: CO2 Monitorer Material: ABS CO2 Detection Range: 400-5000 ppm Detection Temperature Range: -10℃ to 50℃ Detection Humidity Range: 20%-85% RH Sampling Time: 1.5 Seconds Battery: 1 x 1600mah Rechargeable Lithium Battery (Built in) Package List 1 x CO2 Monitor 1 x User Manual 1 x USB Cable