Bluetooth Smart CO2 Detector: Supports Bluetooth protocol for intelligent monitoring of air environment. With TFT full view display, you can wake up the screen by pressing buttons or gestures. Smart Alarm for Excessive CO2 Concentration: The smart alarm function is designed to prevent any uncomfortable air conditions. When a CO2 concentration exceeding the set value is detected, the smart alarm will be triggered to warn the families for bettter taking care of . Wide Application to Care for Everywhere, It can be used in most indoor , such as home, hotels, school, offices, theaters, etc. Wherever you go, it can help monitor and create the most appropriate environment in real time. Multiple Placement Optional, With a plate and hanging hole of integrated body design, it supports placement of putting on desk or hanging . You can place it anywhere, without taking up too much space but gives you an essential role. Auto-Calibration Mode for More Accurate Measurement, 1. Automatic calibration: The product will automatically calibrate every 24 hours since power-on. The default zero value for auto calibration is 400ppm. 2. Manual calibration: After working continuously for more than 20 minutes in a stable gas environment with known CO2 concentration, press the button 5 quickly to start manual calibration mode and the calibration period is better not 3 months. High-accuracy CO2 Detector With built-in high-precision monitor, you can customize alarm function in App. The monitor displays accurate and sensitive data to keep you informed in real time of indoor air conditions and escort for your comfortable life. Customized Alarm Value Function Set carton dioxide concentration alarm values for different scenarios by the phone. When the current air environment reaches the corresponding critical point of CO2, making the air environment more suitable for personal needs. 3 in 1 Multi-function Detector Built-in carbon dioxide monitor, temperature and humidity sensor, give you a real-time monitoring and sensitive induction, monitor the comfort of the environment, to raise family happiness. Technical specification: Product Name:Carbon Dioxide Detector Working Voltage:5V/2A Working Temperature:-10~50 Working Humidity:0%~95%RH(No condensation) Carbon Dioxide Range:400~5000ppm Temperature detection range: Celsius (-10~99) Fahrenheit (-4~210) Humidity detection range:0%~95%RH Wireless Protocol:Low-power Bluetooth Dimension:85 x 85 x 30mm Material: plastic Color: As Shown Package Contents: 1 x Smart 3 In 1 Air Quality Monitor 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.