Features Automatic Brightness Adjustment: According to the surrounding brightness, CO2 meter automatically adjust the screen display brightness so that the screen is visible and not dazzling. Energy Saving: When no one is in use, the humidity temp meter screen can be automatically turned off to reduce energy consumption, and the sensor can still transmit data to the net through WIFI when the screen is turned off, and check the realtime value NDIR Sensor: Our air quality monitor adopts NDIR sensor and more accurate and sensitive. Lets you have reference values to tidy up your environment faster. Multiple Uses: This air quality monitor is essential for a home. Help detect gas and air pollution in your home, kitchen, bedroom, office, school, car, hotel, travel, camping, party. Detecting Contents: This air quality meter can detect PM2.5, CO2, HCHO, TVOC, temperature and humidity. Practical and multifunctional. Feature: 1. With Fan: Air quality monitor has higher accuracy, with fan to increase gas flowing to increase detection range and sensitivity. Specification: Item Type: Air Quality Detector Material: ABS Battery: Lithium battery 3.7V 800mAh (with built in battery) Basic Parameters: PM2.5: 0-1000μg/m³ Package List: 1 x Air Quality Meter 1 x USB Line 1 x Manual Package List 1 x Air Quality Meter 1 x USB Line 1 x Manual