Air Detection: Our Smart Carbon Dioxide Value Tester Gas Analyzer uses vacuum semiconductor TVOC sensor. real-time and accurate CO2 concentration, TVOC, formaldehyde, ambient humidity and temperature, with date and clock display. System Auto Alarm: Our carbon dioxide instrument is easy to use. No calibration is required, and it can be tested at startup, when the carbon dioxide concentration exceeds 1800ppm, an alarm will be issued to inform you to keep the indoor environment ventilated in time. Built-in battery: Our carbon dioxide instrument contains a 1200mAh rechargeable battery that can be removed and equipped with a USB charging cable that can be used while charging. Easy to Use: Our carbon dioxide detector is compact and portable and can clearly display the temperature and humidity of the environment. Suitable for offices, bedrooms, gymnasiums and other usage scenarios. Warm Tips: Our carbon dioxide detector can detect carbon dioxide from air. air, temperature and humidity in real time. The detection value will constantly change, so there will be a measurement error value. It can perform continuous start-up detection to ensure getting an accurate value. Carbon Dioxide Detector: The smart gas analyzer for carbon dioxide value tester carbon uses a solid-state TVOC sensor of air, temperature and humidity of air quality. This is a a high-quality air quality detector, using high-quality electrochemical detection module, with good accuracy, stable performance, strong anti-interference ability, low consumption and long service life . Accurate detection of carbon dioxide. The large display shows power, CO2, temperature and humidity. Adopt high quality electrochemical detection module, good accuracy, stable performance, strong anti-interference ability, low consumption and long box life. The product does not ;needs no calibration, it can be tested when powered on, and it can accurately detect carbon dioxide. Large screen displays power, CO2 value , temperature and humidity. Equipped with a large display, different font colors indicate different air quality, 400-800ppm: flashing green, 800- 1800ppm: flashing orange, over 1800ppm: flashing red Fengming Alarm Hundreds of vents on the back not only accelerate the convection between the air and the machine to efficient detection, but also provide good heat dissipation. Colour: white (semiconductor) Delivery quantity: 1 piece become very rich