1、HIGH ACCURACY AND SENSITIVITY: The CO2 monitor is highly accurate and can measure CO2. With a clear and easy to read display showing CO2 levels of 400‑5000ppm, the temperature and humidity are also displayed, the monitor ensure that you breathe well 2、APP LINKAGE DATA: Download the for Tuya APP on your mobile phone, you can connect the CO2 temperature humidity detector with the mobile phone, see the real time or historical data on the mobile phone, and care about the quality every day 3、REAL TIME MONITORING: Sample 1.5s/time, the CO2 monitor equipped with an alarm will alert you when the PPM value increase(support for turning off the alarm clock). You can calibrate the CO2 monitor to ensure its accuracy over time 4、RECHARGEABLE BATTERY AND ADJUSTABLE BRIGHTNESS: Micro USB interface charging interface, 2000mAh large capacity battery, you can use CO2 monitor for a long time without having to change the battery frequently. Charging the CO2 monitor for 2 hours ensure 24 hours of use. You can also adjust the brightness of the monitor to protect your eyes in different light 5、EASY INSTALLATION: The CO2 device is designed with wall holes, wall hole stickers to assist installation, easy to install, with a 10ft USB charging cable so you can put anywhere you want and charging anytime and anywhere Item Type: CO2 Monitor Screen Display: HD LCD screen CO2 Detection Range: 400-5000 ppm Mobile APP: For Tuya APP Temperature Range: -10℃ to 50℃ Detection Humidity Range: 20%-85% RH Sampling Time: 1.5 Seconds Battery: 1 x 2000mah rechargeable lithium battery 1 x Monitor 1 x User Manual 1 x USB Cable 2 x Screws 2 x Wall Plugs 1 x Installation Sticker