Formaldehyde detector can effectively detecting formaldehyde and TVOC concentration in the environment you are living, such as a newly decorated house, the rented house, office, car and more. It's also a temperature and humidity monitor, which brings more convenience for your family. Paying attention to the harmful gas in the air, living a healthy life right now! Features: It adopts semiconductor gas sensor and air convection detection principle, can detect harmful gas in your home quickly and accurately. Multifunction air quality tester and temperature/ humidity tester: it displays formaldehyde (HCHO) and TVOC concentration, air quality index, air quality class, temperature and humidity. 2.8" large LCD screen with backlight makes it clear to read even in dark environments. Foldable bracket can be placed on the desktop and is space-saving when not in use. Built in 700mAh rechargeable battery, quick to charge it via Type-C USB cable. Portable and lightweight, easy to carry. Alarm buzzer: when the formaldehyde concentration is above 0.3mg/m³, the buzzer will beep to remind you that the air quality is bad. It detects formaldehyde and TVOC concentration in the air, can be widely used in home, car, hotel, apartment, office and more places. Note: Please ventilate the new product for 2 hours and calibrate it in the open air before detecting. Specifications: Color: White Material: ABS Display: 2.8" LCD Screen Principe of Gas Detection: Semiconductor Gas Sensor Gas Detection Range: 0.000~2.888mg/m³ (Formaldehyde), 0.000~9.999mg/m³ (TVOC) Temperature Detection Range: -30~60, 1 Accuracy Humidity Detection Range: 0~100%, 1% Accuracy Built-in Battery: 3.7V 700mAh Lithium Battery Item Size: 155 * 75 * 25mm / 6.10 * 2.95 * 0.98in Package Size: 17.5 * 12.5 * 3.5cm / 6.89 * 4.92 * 1.38in Package Weight: 150g / 5.29oz Package List: 1 * Air Quality Monitor 1 * USB Cable (Type-C) 1 * User Manual