Trolmaster Dry Contact Station Wall Fans & Others This Easy To Use Co2 This Easy To Use Co2 Controller Determines Precisely When To Activate And Shut Off Co2 Generators To Maintain User Defined Low And High Co2 Values In The Grow Room The Unit Can Deactivate Co2 Enrichment During The Night Cycle And Perform Co2 This will give you the tightest looking finished trim possible The DSD 1 connects into the “devices” line on the Hydro X and can be set to control an almost infinite number and types of devices such as:Lighting contactorsLight Deprivation curtainsPump contactorsTemperature devicesHumidity devicesCO2 devicesFeatures:LCD Display for easy operationSeamless connection with Hydro XMultiple purposes assignmentPlug & playPackage includes:1 x TrolMaster Hydro X Dry Contact Station1 x TrolMaster 16ft RJ12 Cable1 x TrolMaster 4ft RJ12 Cable1 x TrolMaster RJ12 T Splitter normally open and or normally closed contacts on the DSD 1