Feature 1LCD and Alarm Function: This air quality tester has a 3.2 inch color LCD display with live voice prompt and alarm function. 2Applicable: This CO2 detector is mainly used to monitor the concentration, temperature and humidity of PM2.5, HCHO, TVOC, CO and CO2. 3Built in Memory: The air quality detector has built in memory, which can record the data of the past 8 hours and view it through for Interfacex. 4Battery: The air quality tester has a built in 803450 model, 1500MAH polymer battery, which can continuously monitor the battery power and has a low power reminder function. 5Easy Operation: The CO2 meter can turn on or off the voice function with one key, which is convenient for operation. It can also switch between Chinese and English freely.Item Type: Air Quality TesterMaterial: ABS Gross Weight: 430g/15.2ozApplicable: It is applicable to the air concentration test of such confined spaces as home, wooden furniture, leather products, office space and indoorBattery: Shipped with built in battery, Model 803450, polymer battery, 1500MAHProduct Size: 172x82x31mm/6.8x3.2x1.2inResolution: 320x240Operating Temperature: 0-50 Operating Humidity: 90 percents RHUSB: 5VDC 1.5ACharging Interface: Type C .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x Air Quality Tester1 x USB Cable1 x Manual