INKBIRDPLUS Indoor CO2 Meter, Air Quality Monitor can Monitor Temperature & Humidity, Carbon Dioxide Detector with Alarm Function, CO2 Detector for Grow Tents, Wine Cellars, Homes, CarsBrand: INKBIRDPLUS Features: WARNING ALARMSThis CO2 detector is designed with 3 stages of CO2 concentration, it will alarm you when the detected CO2 concentration is beyond the safe value you customized. normal (400 700 ppm), warning (700 1500 ppm), dangerous (1500 5000 ppm). PREMIUM DETECTORThis carbon dioxide detector reads the current CO2 concentration, temperature, and humidity with its premium internal sensor quickly and accurately. CONVENIENT