[3 Color Status Indicator]With multiple alarm, there is 3-color Light Indicator and 3 Facial Comfort (1500~5000 ppm with bad , red light; 700-1500 ppm with normal , yellow light; 0-700 ppm with good , green light. You Can Intuitively Understand The Air Quality You Breathe.[3-in-1 Air Quality Monitor Data]Detect CO2, Temperature and Humidity. CO2 measuring function, the high-precision thermometer and hygrometer can also be used to monitor indoor temperature and humidity in real time. It is an indispensable device or office.[High Accuracy CO2 Sensor]Built in infrared sensors that can accurate detect air of Carbon Dioxide(CO2). uses non-dispersive infrared technology (NDIR), Full temperature range correction, high measurement accuracy, fast response, resolution up to 1 ppm, measuring range up to 0 to 5000 ppm.[USB Rechargeable]Rechargeable lithium battery with a capacity of 2400 mAh, standby for 18 hours, it supports USB charging and battery indicator, which is a good solution for your testing needs in a different environment for a long time.Product name:Carbon dioxide monitorModel:PTH-5CO2:400-5000PPMAccuracy:50PPM 6%Temperature:-10~40Humidity:20-80%Power-supply:2400mAh lithium batteryColour:blackMaterial:plasticPackage Contents:1 x CO2 sensorOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.