This is a kind of air quality detector, which can be used to test temperature and humidity and the concentration of CO2. Equipped with large digital display with backlight, you can see the remaining electric quantity, CO2 value, temperature and humidity data clearly. The color circle will changed according to the infrared detection data. You can have a try. Features: Multiple function, real time testing the concentration of CO2, temperature and humidity. Selected quality sensor, high accuracy, anti-interference, with quickly reaction speed. Equipped with large digital display with backlight, you can see the remaining electric quantity, CO2 value, temperature and humidity data clearly. The color circle will changed according to the detection data. Application areas: agricultural planting, greenhouse vegetables, production warehouse, material processing, home interior, etc. Specifications: Name: CO2 Detector Model: K02 Material: ABS Display: LCD screen + backlight Color: black, white (optional) Battery: 1 * rechargeable battery, 3.7V, 1200mAh (included) Applicable temperature: -1 to 70 Applicable humidity: 10-70%RH Monitoring float: 20%-50% Charging standard: 5V-1A Standby time: about 300-420 minutes Item size: 90 * 70 * 35mm / 3.54 * 2.76 * 1.38in Package size: 145 * 130 * 45mm / 5.71 * 5.12 * 1.77in Package weight: 200g / 7.05ounce Packing List: 1 * CO2 Detector 1 * USB Cable 1 * Guideline