Description: Carbon dioxide concentration detection, thermometer, and hygrometer in one. Simple operation: long press the key on the right side for 3 seconds to turn on and off. No need to calibrate after starting up, work, and detect automatically. Battery: Built-in lithium battery 1200mAh,USB power cord. CO2 Detector. It displays the current CO2 data, as well as the temperature and humidity data, the colored ring will change according to the CO2 content. 2.5inch color screen, compact and portable, can be placed in the kitchen, bathroom, living room, desk, coffee table, and other environments. Specification: CO2 Detection Range: 400-5000PPM CO2 Detection Sensitivity: 1PPM TVOC Detection Range: 0-2PPM Temp Measurement Range: 0~50°C Temp Measurement Accuracy: ±1°C Humidity Measurement Range: 0%~99%RH Humidity measurement Accuracy: ±2%RH Charging Mode: DC5V 500mA micro USB interface Battery: built-in lithium battery 1200mAh Size: 89x70x35mm/3.54x2.75x1.18inch Screen: about 2.75inch Size Chart: Instructions 1. Press and hold the"Power" key on the right for 3 seconds to turn on and turn off, then it will display the current air quality parameters 2. CO2 Detector. It displays the current CO2 data, as well as the temperature and humidity data, the colored ring will change according to the Co2 content 3. It is a simple operation that you can long press the "on-off" key on the right side for 3 seconds to turn on and off 4. The USB can be charged by plugging in a 5V power supply. The battery icon flashes in the charging state, and it stops when it is full. If the display is full but still flashing, it means that the charging is not saturated. Please wait for a while Package Includes: 1 x Host 1 x USB Charging Cable 1 x Manual