Feature: 1. 1. The large screen is easy to read-this air quality monitor uses a large LED color screen, so that everyone can easily read all real-time readings. It will automatically detect OC2, temperature and humidity when it is turned on. Help you detect home, kitchen, bedroom and office in real-time. Indoor air quality in schools, apartments, etc. 2. 2. Accurate monitoring and automatic calibration-This air quality monitor adopts a dual-channel high-performance NDIR infrared sensor, dual-channel receiving window to enhance the reference signal so that the CO2 detector can accurately detect air quality in real-time; it adopts a Swiss high-end temperature and humidity module, accurate Monitor the temperature and humidity values ​​in the air; automatic/manual calibration function, no need to worry about the accuracy of the data. 3. 3. Real-time monitoring, the automatic alarm-this quality detector can accurately and clearly detect the air quality around you. It can monitor the air quality in the area in real-time. When the value exceeds the preset value or manually set value, the CO2 detector will automatically alarm and prompt you to turn on the air circulation. Channels or air purifiers increase air circulation, thereby improving air quality. 4. 4. All-weather monitor-The air monitor has a built-in high-performance low-power processing chip and rechargeable 3 AA batteries, equipped with a type-c data cable, and must be connected to a power source to allow the device to accurately and continuously monitor the air quality. 5. 5. Portable and easy to use-the palm-sized portable carbon dioxide detector is easy to carry, and can detect the gas quality in the bedroom, living room, kitchen, office, car, school, hotel, campground and other environments. Specification: Name: Three-in-one air quality detectorFunction: air quality/temperature/humidityMaterial: ABSSize: 165*115*85 (mm)Measuring range: 400-5000ppmMeasuring object: airMeasurement accuracy: ±100ppmResolution: HDVoltage: 5 (v)Power supply: 3 AA batteriesPower supply: TYPE-C interfaceWeight: 0.27 (kg) Package List: 1* Detector1* Charging Cable1* Manual Note: Due to the lighting effects and shooting angles, there is a color difference in the product, please understand.Due to manual measurement, there is a tolerance in the product size.