Product Specifications
Display method: 4.3 inch LCD screen display, 320 x 240 pixels
Atmospheric pressure: 86Kpa - 106Kpa
CO2 Technology :  infrared ( NDIR) 
Detection method for PM: Laser Scattering
HCHO  technolology :Electrochemistry sensor
TVOC technolology: Semiconductor  sensor      
Temperature and Humidity sensor                                                                            
Sampling time: 1.5 seconds
Product Size: 131 x 78 x 67.5mm
Detection temperature: -10°C to 50°C; 14°F to 122°F
Relative humidity: 20% - 85%
Storage temperature: -10°C to 60°C; 14°F to 140°F
Concentration unit for CO2: ppm
Concentration unit for PM: ug/m³
Concentration unit for HCHO and TVOC: mg/m³
Power source: Lithium battery with 3000 mAh capacity; 5V DC power charging via micro USB port
Product weight: 560g

Product Description
This product is a multifunctional air quality detector that detects Carbon dioxide CO2,Formaldehyde (HCHO),  Total Volatile Organic Compounds (TVOC), Particulate Matter <2.5 micron-sized particles (PM2.5/1.0/10),  Temperature, and Humidity with clock and record function. As a scientific air quality detection device, it  combines multiple air sensors with a built-in fan to allow real-time monitoring of CO2,formaldehyde (HCHO),  total volatile organic compounds (TVOC), PM2.5/1.0/10, temperature, and humidity on its digital LCD display.

About Charging
When low battery icon is displayed, the device needs to be charged. Insert the included or another  compatible micro USB charging cable into the device. Attach the other end to a USB DC charger (such as a  smartphone charger) that outputs DC 5V at >=1000mA. Fully charge for at least 2-3 hours before use. Avoid  charging with a USB computer port which only outputs 500mA.