Small size, light weight, easy to carry, and convenient to use and carry. Equipped with high-quality temperature sensor and humidity sensor, it can detect quickly and accurately. The 2.8inch LCD screen with backlight clearly displays the current values of CO2, temperature and humidity. The colored circle change according to the current CO2 value. The operation is simple, no calibration is required after startup, and it works and detects automatically. Widely used in home use, educational institutions, agricultural planting, greenhouse planting, warehouse operations, material processing, etc. WiFi Smart CO2 Detector Power:5V1A Sensor:400-5000PPm Accuracy:±(50ppm+5% reading value) Communication protocol:WiFi Colour:As Shown Material:ABS Package Contents: 1 * Detector 1 * English instruction manual 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.