With the Titan Controls Atlas 2 it’s as imple as plugging in your CO2 generator or regulator, and you’re ready to go. Preset CO2 control at 1500 PPM. Built-in self calibration feature. Easiest to use CO2 Controller on the market. Simply plug in your CO2 generator or regulator and you are ready to go. Built-in photocell allows CO2 enrichment only during daylight hours. Durable powder-coated steel housing. 15 Amps maximum/120 Volts/60 Hz. Patent No. D657,748.