Description Description: CO2 Detection Range: 400-6000PPM CO2H Detection Sensitivity: 1PPM TVOC Detection Range: 0-2PPM Temp Measurement Range: 0~50C Temp Measurement Accuracy: 1C Humidity Measurement Range: 0%~99%RH Humidity measurement Accuracy: 2%RH With buzzer (value greater than 1000) Power supply: 1500 mAh lithium battery, charged by 5V DC power supply via micro USB interface Charging time: 3~4 hours Use time 3.5~5.5 hours,It can be charged by USB Support Bluetooth compatible APP, read up to 1440 sets of data for 60 days Size: 9*7*3cm/3.54*2.75*1.18inch Screen: about 2.75inch Net weight: about 320g Features: 6 in 1: can use as a carbon dioxide concentration detection, thermometer and hygrometer at the same time. TVOC/HCHO/Bluetooth compatible Battery supply: built-in 1500mAh lithium battery, use USB charging cable to charge it. Color screen: display the current CO2 data, temperature and humidity data. The colored ring will change according to the CO2 content. Easy to operate: long pre the on-off key for 3 seconds to turn on and off. It will detect the CO2 automatically. Compact and portable: can be placed in the kitchen, living room, bedroom, or take it when going out. Package Includes: 1x CO2 Meter 1x1500MAHbattery 1x Manual 1 * USB data cable Note: The product is sealed and shipped for 7 to 15 days, because there are perfume and other gases in the box. After receiving the product, you need to stand for 1 hour, wait for the abnormal gas to volatilize, and start normal measurement; In addition, if the sensor is heated for more than 2 hours, the temperature measurement will be 2 to 3 degrees Celsius higher than the normal temperature. This is a normal error. If it is unacceptable, please do not buy it, thank you