Protect Your Every Breath Since clean air means a lot to every one, the 5-in-1 air quality monitor will be your best choice. It can accurately monitor CO2, TVOC, HCHO, humidity& temperature. You can monitor the environment at any time. Accurate & Reliable Equipped with a fast-responding and sensitive high-performance chip, the air quality monitor can precisely capture the weak currents generated during electrochemical reactions. Dual color & voice alerts keep you informed of the current air quality conveniently. Low Power AlertsBuilt with 1200mAh rechargeable battery and packaged with one 5V USB cable, the standby time can last for 10 hours. Never be anxious about low power. Safety Design The mesh design allows for better heat dissipation during operation, preventing the device from getting hot, and more accurate measurement data. Warm Notice Please notice that this air quality monitor is designed for indoor spaces, so please close the door & windows before testing. Or else the data may not be accurate. We recommend using the monitor and keeping it working for at least 60 minutes before reading the data.