Multiple Detectable Gases - BIAOLING upgraded indoor air quality monitor built in DART electrochemical sensors that can accurate detect air of Carbon Dioxide(CO2), Formaldehyde(HCHO), Volatile Organic Compound(TVOC), Particle Matter(PM2.5/PM10). This new mode can offer real time data and mean value, it is recommend you to focus on mean value of each gas after testing enough time because long-term monitoring, the real-time data exist instability. Know Your Air Clearly - For everyone,It's necessary to know the air quality of the place where you live.This air monitor have LCD Digital Color Screen, large and easy to read. This air monitor will offer color indication to show overall environment quality which have Good(Green), Mild Pollution(Yellow),Severe Pollution(Red) three grade. You can directly to know the overall environment quality and track on each gas mean value to know what gas in air is unsafe and take accordingly actions. Easy Operate - This air monitor is easy to operate which just pressing the functional button and one full page design make everyone can easy to read all the real time readings at the same time. Size about 5.83” * 2.76” * 1.18”. It's easy to carry the intelligent air quality monitor that can help us detect the air quality in household, kitchen, bedroom, office, school, car, hotel, travel, camping, party etc...especially in which has baby,child and pregnant woman. 3000mAh Rechargeable Battery - BIAOLING Air Quality Detector has a 3000mAh rechargeable lithium battery and packed with USB cable that can last up to 8-12 hours. It is recommend you to charge 6 hours before first use and do not use it when charging or in lower battery because the data may not so accurate. Built-in low power consumption processing chip, can carry on long time uninterrupted monitoring to air quality. It will always take care of you and your family health. Kindly Note - Please be aware this air quality monitor is for home indoor place, please kindly close door and window before testing. We do recommend using the monitor as a stationary unit and focus on long time(at least 60 minutes) mean values and overall environment quality indication.If you have any questions regarding monitor functionality or you need any assistance on how to re-calibrate the sensors, please contact us via email.