1. Multi-Functional detection: Measure CO2, Temperature, and Humidity, with high accuracy NDIR sensor 2. Wi-Fi Connection & Smartlife/ Tuya APP Remote Control: Connect via 2.4G Wi-Fi to the Tuya Smart App for viewing the monitoring data and the alarm history. No matter where you are, you can monitor the indoor air quality of your house. 3. Real-Time Notification: Sound Warning Alarm on the device when CO2 levels reach or exceed a preset threshold. You will also be notified on your Smartphone whenever an alarm is triggered. 4. Auto-Calibration: To the accuracy of the CO2 sensor, make sure it is placed in a ventilated environment for 24 hours before being used for the first time. 5. Power Supply: Built-in 1400mAh Li-Ion rechargeable battery-powered up to 8 hours operation. Also powered with USB power or 5V Adaptor. Different batches may result in different product appearances, printed text, and colors, which do not affect usage. Colour:White Material:plastic Package Contents: 1 x Co2 Detector 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.