About this item MULTIPLE DETECTABLE GASES - For everyone,It's necessary to know the air quality of the place where you live.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). Those readings involve detection of toluene, harmful chemical substances and pollutants in the air such as carbon dioxide, carbon monoxide,smoke,fog,dust,ink and others. NEW DESIGN - Newest unique mold and design with 5.5 inch LED Screen Digital Display; Size about 4.9 * 3.1 * 1.3. 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 TO OPERATE : Just press the power on / off button 3 seconds, you can easily operate this air monitor, designed with LED digital display, can provide the average value of each gas, real-time detection of harmful HCHO and TVOC in the room.It's easy to carry the intelligent air quality monitor that can help us detect the gas air pollution in household, kitchen, bedroom, office, school, car, hotel, travel, camping, party etc...especially in which has baby,child and pregnant woman. 2000mAh RECHARGEABLE BATTERYBuilt with 2000 mAh rechargeable battery and packaged with one USB cable, the standby time can last for 8-10 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.