Name:WiFi Smart CO2 detector The product has built-in sensor that support high precision detection datas. Type:Air quality Monitor CO2 Sensor:400-5000 ppm Accuracy:(50ppm 5% reading value) Humidity sensor:0-100%RH Accuracy2%RH(25) Temperature sensor:- 40- 85 Accuracy0.3 Communication protocol:WiFi APPS:Tuya Smart & Smart life Default CO2 alarm level (Unit: ppm) : 1.(CO2Less than 800) no alarm, display smiling face to remind that the ernvironmental CO2 concentration is low and the living environment is comfortable 2.(800 Less than CO2 Less than 1200) no alarm, smiling expression indicates that the ervironmental CO2 concentration is moderate 3.(1200 Less than CO2 Less than 1500) no alarm, uncomfortable expression indicates that the ervironment is not good enough 4.(1500 Less than CO2 Less than 3500) the alarm sound (drip, drip, drip) sounds three times, indicating that the CO2 concentration is relatively high and it is not suitable for people to live 5.(3500 Less than CO2 Less than 5000) the alarm sound (drip, drip, drip, drip, drip) sounds 6 times, indicating that the CO2 concentration is very high. Please pay attention to environmental safety 6.(5000 Less than CO2) when the concentration reaches 5000, the buzzer keeps alarming,indicating that the CO2 concentration is extremely high and the ervironment is dangerous Colour:White & Black Material:ABS Size:80x34x101mm Package Contents: 1 * WiFi Smart CO2 detector 1 * USB cable 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.