Calibrated and maintenance free, the HydroGEN CO2 Monitor utilizes top quality SenseAir brand CO2 detection technology. This monitor will work with any CO2 generator or bottle regulator. It is simply all you need to regulate CO2 in your garden. Programmed to turn on at 1300 ppm and off at 1500 ppm. Easy to read indicator lights show CO2 levels. Installs easily with our wall mount bracket. 120 Volt switched piggyback cord. Just the basics approach makes this unit very affordable.