[Compact Size & Remote Tuya APP Control]: The compact body design of this CO2 detector, along with its simple and stylish appearance, makes it and easy to carry. Wall-mounted design, built-in multiple sensors for real-time detection and real-time data refresh. The WIFI function supports real-time data viewing on your mobilephone via Tuya or SmartLife APP. [Multifunctional Design]: This device has a multi-functional design, supporting the detection of the air quality index, formaldehyde, organic pollutants, PM2.5, PM10, carbon monoxide, carbon dioxide, temperature, and humidity, allowing you to know the air quality around you wherever you are. It also features a real-time curve view function, enabling you to see the trend curves of eight groups of parameters: HCHO, TVOC, PM2.5, PM10, carbon monoxide, CO2, temperature, and humidity. [Air Quality Classification & Intelligent Alarm]: This device is designed with a bright 2.8-inch TFT color display to show measurement results and supports switching between two interfaces. Equipped with an air quality classification function, this device uses four different colors to correspond to different air quality levels, allowing you to understand the current air conditions more accurately and visually. It also features a buzzer alarm function to prompt timely action when necessary. [Accurate Detection]: It features a 3D porous housing with multiple ventilation holes to facilitate real-time air circulation and convection. This design ensures that the sensor is in fullcontact with the air, enhancing its sensitivity and enabling accurate detection of small particle content. [Wide Applications]: Built-in 1200mAh high-capacity rechargeable lithium battery and equipped with a Type-C charging port ensures long-lasting performance suitable for complex environments. It is versatile and can be widely used in environments, including homes, greenhouses, camping barbecues, factories, automobiles, etc. Material: Plastic Color: Black Battery: 1 x built-in 2500mAh lithium battery (included) Working voltage: 5V Charging mode: 500mAh Type-C interface PM2.5: 0-999 /m PM10: 0-999 /m HCHO: 0-9.999 mg/m TVOC: 0-9.999 mg/m Carbon monoxide: 0-1000 PPM : 0-500 Temperature: 0-70 Humidity: 0-99%RH Package Contents: 1x Air Quality Meter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.