Features: 【Know Your Air】This upgraded indoor air quality monitor built in DART electrochemical sensors that can accurate detect air of Formaldehyde(HCHO), Volatile Organic Compound(TVOC AQI). Those readings involve detection of toluene, harmful chemical substances and pollutants in the air. 【2021 Newly Design】2021 Newly design placement air monitor built with LCD Color Screen Digital Display. Newest unique mold and design with LCD Color Screen Digital Display; it can offer mean value for each gas because long-term monitoring, the real-time data exist instability. 【Long standby】Lithium batteries are used as power supply equipment to ensure long standby while saving energy and environmental for protection, ensuring real-time monitoring and complete monitoring. 【Easy Carry & Widely Used】Formaldehyde /TVOC / AQI monitoring to prevent any respiratory disease. It's easy to carry &it is widely used in homes, offices, enterprises, governments, schools and automobiles,etc. Detect and monitor air problems at any for time to ensure the for health of family members or employees 【Warm Note】Please be aware this air quality monitor is for home indoor place. We do recommend using the monitor as a stationary unit and for focus on 30 and 60 minute mean values and overall environment quality indication because long-term monitoring , the real- for time data exist instability. Specifications: Material: plastic Measurement accuracy: 0.001 Measurement object: Formaldehyde, TVOC, Air Quality Index Package Includes: 1 Pcs Air Quality Monitor note: Battery is included in it. Please allow 0-1cm error due to manual measurement. 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. Thank you!