Product Features: 1. Multi-Functional detection: Measure CO2, Temperature, and Humidity, with high accuracy NDIR sensor, smoke 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 it is placed in a ventilated environment for 24 hours before being used for the first time. 5. Power Supply: Built-in 1400mAh -Ion rechargeable battery-powered up to 8 hours operation. Also powered with USB power or 5V Adaptor. Specifications: smoke sensor: Photoelectric smoke sensor CO2 Sensor: NDIR Co2 Co2 Measure range: 400-5000ppm Temperature Measuring Range: -20-60C 2 C Humidity Measuring range: 5%-95% 5%RH Co2 and Smoke alarm: 85dB (1-) Smoke sensitivity: 0.1% db/m-0.3 % db/m Battery capacity: 1400mAh Resolution: 1 PPM APP: Smartlife/ Tuya Material: plastic colour: B-white Package Contents: 1 x Air Quality Monitor 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.