SwitchBot CO2 Detector, Air Quality Monitor Indoor, CO2 Monitor for CO2/TEMP/Humidity, Portable Carbon Dioxide Detector for Home/Car/Office/Greenhouse Meter Pro CO2 is up for auction in Home & Kitchen. The current bid is $4.50, 92% below the $53.54 MSRP, in As Is condition. This auction has ended — similar items appear in live auctions regularly.