Unis CO2 ControllerUNIS CO2 CONTROLLER Use in conjunction with a timer to ensure no CO2 is released during your plants night. The Unis CO2 Controller is easy to set up and use, giving you reliable results every day. Just simply dial in your grow room size on the Unis controller and connect the regulator to your gas bottle to use. There are 16 settings to choose from so you should always be able to fit it to your needs depending on the grow room size you have. The Unis