Features: Stable NDIR Sensor for CO2 Detection. Ideal indoor air quality meter for home, laboratories, hotels, etc. Can lock current environmental monitoring maximum value, used for CO2 measurement, temperature & humidity. With built-in rechargeable lithium battery (about 1600 mAh), the long standby time of the air quality monitor can reach more than 48 hours. CO2 is 0-5000ppm, the accuracy is about 50ppm+5%, and the relative humidity is about 20%-85%, the storage temperature is about -10C to 60C. This device adopts a lightweight design, which is small and easy to carry. Package Includes: 1X Air Quality Monitor Specifications: Material: ABS+Metal Display mode: normal screen display Atmospheric pressure: about 86Kpa-106Kpa CO2 detection method: infrared (NDIR) Sampling time: about 1.5 seconds Detection temperature: about -10-50; Relative humidity: about 20%-85% Storage temperature: about -10C- 60C; CO2 concentration unit: P-PM Power supply: lithium battery, 1600 mA (5V DC power charging via micro USB port) Measuring range: 400-5000PPM Resolution: 1 PPM Measuring range: about -10-50 Humidity range: about 20%-85% RH Measurement accuracy: 1C Measurement accuracy: 4% RH CO2 sensor: infrared (NDIR) note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.