Feature: 1. LCD and Alarm Function: This air quality tester has a 3.2 inch color LCD display with live voice prompt and alarm function. 2. Applicable: This CO2 detector is mainly used to monitor the concentration, temperature and humidity of PM2.5, HCHO, TVOC, CO and CO2. 3. Built 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. 4. Battery: 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. 5. Easy 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. Specification: Item Type: Air Quality Tester Material: ABS Gross Weight: 430g/15.2oz Applicable: It is applicable to the air concentration test of such confined spaces as home, wooden furniture, leather products, office space and indoor Battery: Shipped with built in battery, Model 803450, polymer battery, 1500MAH Product Size: 172x82x31mm/6.8x3.2x1.2in Resolution: 320x240 Operating Temperature: 0-50 ℃ Operating Humidity: ≤ 90 percents RH USB: 5VDC 1.5A Charging Interface: Type C. Package List: 1 x Air Quality Tester1 x USB Cable1 x Manual