Gas Detectors features: Smart Wi-Fi Air Quality Monitor Indoor Air Quality Meter Tester with App Alarm and Data Logger for Testing Formaldehyde VOC Carbon Dioxide CO2 Temperature Humidity Color: we send based on the color or size of the main image of the product page. Quantity：we send based on quantity on title, if there is no quantity in the title, we send based on description. The mini air quality meter is small as your palm, and able to test 5 indoor air quality levels - formaldehyde, VOC, CO2, temp and RH%. Connect it to 2.4GHz Wi-Fi, and you can check the current air quality on your phone via the smart app. The unit will send you real-time alarm prompt if any of the value exceeds the normal range. It is small but satisfies. Features: Accurately measures and monitors the indoor HCHO(formaldehyde), VOC(volatile organic compounds), CO2(carbon dioxide), temperature, and humidity levels. Helps you to check the current air quality in you home remotely, simply view it on phone via the app TUYA. Sends real-time alert prompt when the air quality exceeds the normal range. Able to interconnects with other intelligent home appliances like air conditioner, air purifier, humidifier, etc. to build a smart home. History data graph clearly shows you the changes of air quality in day, month and year. Easy to setup, requires an available Wi-Fi 2.4 GHz frequency signal that is in a state of networking. USB-powered air quality detector can be powered by any usb devices, easy to be carried around. Specifications: Material: PVC Color: White Input: 5V, 1A Formaldehyde Measuring Range: 0~10 mg/m³ VOC Measuring Range: 0~99.9 ppm CO2 Measuring Range: 0~1000 ppm Temperature Measuring Range: 0~60℃ Humidity Measuring Range: 0~95% Item Size: 9*9*3.5cm / 3.54*3.54*1.37in Item Weight: 60g / 2.11oz Package Size: 9.5*9.5*4cm / 3.74*3.74*1.57in Package Weight: 92g / 3.24oz Packing List: 1 * Air Quality Monitor 1 * USB Cable 1 * Eject Pin 1 * User Manual(English)