Feature: 1. MAIN FUNCTION: This WiFi smart detector can accurately detect the current carbon dioxide concentration, temperature and humidity in the air, reliable and durable. 2. SUPPORT CALIBRATION: This detector can be easily calibrated by pressing 3 buttons simultaneously in an open environment and letting it sit for 200 seconds. 3. WITH BATTERY: The capnography monitor has 2400mAh lithium battery and is equipped with a charging cable to support long term continuous use. 4. CLEAR DISPLAY: The smart monitor adopts a large and clear LCD color screen for easy viewing of measurement data and improves detection efficiency. 5. APPLICABLE SCENES: Designed with a hanging hole, this air detector is ideal for use in grow rooms, offices, kitchens, schools, cellars and cars. Specification: Item Type: 3 in 1 WiFi Detector Carbon Dioxide Detection Range: 400-5000ppm ±50ppm+5% Temperature Detection Range: -10-40℃ ±2℃, 14-104℉ ±3.6℉ Humidity Detection Range: 20-80%RH ±5%RH Power Supply: Built in lithium battery 2400mah (with built in battery) Wireless Connection: WIFI (only for 2.4GHz WiFi network) Application: Indoor carbon dioxide meter for grow tents is ideal for use in grow rooms, offices, kitchens, schools, kitchens, school cellars and cars. Package List: 1 x WiFi Detector 1 x User Manual 1 x Charging Cable