Digital Multifunctional Gas Analyzer Air Quality Tester Indoor/Outdoor CO2 Meter HCHO & TVOC Detector Monitor. Specification: Item: Digital Air Quanlity Detection. Material: ABS. Color:  White. Measure Medium: PM2.5 & TVOC & HCHO & CO₂. . Test Function: PM2.5/PM1.0/PM10. 0.3um/0.5um/1.0um/2.5um/5.0um/10um number of particles. TVOC/HCHO/CO₂. Temperature & Humidity. PM2.5 Test Range:   0~6000g/m⊃3. Temperature Test Range:   -9~55°. Humidity Test Range:  0~100%. Detection Technique:  Semiconductor Sensing Technology. Working Temperature:  -9°~55°. Relative Humidity: <80%HR. Battery:  1 * 3.7V 600mA Li-ion Battery (Built-in). Input:  5V, 1A. Date & Time Setting: Users can set the current date and time. Adjustable Automatic Shutdown Time Setting Range: 10 Minutes - 18 Hours. Adjustable Backlight Brightness Setting: 10% - 100%. Historical Data Settings: Users can view historical data saved by the system. Maximum Storage Management Space: 65,534pcs. Adjustable Timing Storage Settings: 10 Minutes - 18 Hours. Adjustable Timing Screen Switching Settings: 10 Seconds - 600 Seconds. Weight:  232g / 8.2oz. Size: 100 x 58 x 78mm / 3.9' x 2.3' x 3.1'. Instructions for use: -Startup shutdown: The button on the right side of the product  is the power switch key，press button for 1 second starting up，after starting up，you can shut down by pressing the button 2 seconds. -Functional use: After starting up，you can switch the display interface by using the left button and right button of the product, Press the middle button to keep the data in real time. -System settings: Long press the middle button for 3 seconds,  enter the system setting state, select the function setting by the left and right keys, press the middle button to confirm entry. -Product charging: The product has a built-in 3000MA lithium battery, which can be charged by a USB port on the left side of the product. -Product reset: The square hole in the left side of the product is a reset button and a thimble is required. Package Includes: 1 x Air Quality Detector. 1 x USB Cable. 1 x User Manual