Jicfung Air Quality Monitor Detect Test Indoor Tester 3-in-1 Carbon Dioxide Detector Reader CO2 Alarm 400-5000ppm…

Amazon.com Price: 24.99 (as of 09:15 EST- More info)

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This CO2 meter need to be charged for several hours first with the USB cable included in the package box after you receive it .
The built-in 2500 mAh battery can provide more than 24 hours of standby time when fully charged, in addition to real-time power through the included usb charging cable, this enables long-term monitoring of air quality level. Press the main function key quickly to turn on/off the automatic alarm function (An alarm will be issued when the CO2 reading exceeds 1000ppm).