Feature: 1. Smart Monitor: Through this 4 in 1 multifunctional air detector, you can detect carbon dioxide, temperature and humidity, as well as night light, allowing us to maintain a good air environment in real time and avoid the harm of CO2 gas poisoning. 2. Accurate NDIR and Electrochemical Sensor: The combination of NDIR and electrochemical sensors can better improve the accuracy of gas detection. 0~>5000PPM CO2 test range. 0℉~122℉ temperature test range, 20~80% RH humidity test range. 3. Portable Size: Vertical design, you can use it in bedrooms, restaurants, kitchens, basements, garages, etc. It can also be used for camping, tent parties, RV travel, car sleeping, truck driving, caves, etc. 4. 2800mAh Battery: Supports USB charging, and fully charged and usable for about two weeks, with super strong battery life. 5. Clear Display: Real time display of all gas data, temperature, humidity. The screen has green, yellow, and red expressions representing the quality of the air of safety, warning, exceeding standards. Specification: Item Type: CO2 Detector Material: ABS Working Temperature: 0℃~50℃ Working Humidity: 0%~85%RH Input Voltage: 5V DC Charging: USB Charging Carbon Dioxide Range: 0~>5000PPM Carbon Dioxide Resolution: 1PPM Note: Shipped with built in battery. Battery Type: Lithium Ion Polymer Battery Battery Capacity: 2800mAh. Package List: 1 x CO2 Detector1 x Cable1 x User Manual