General Hydroponics GH4831 Power Grower Eco Module<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>For use with General Hydroponics Controller systems for multi-unit systems</li><li>Will grow small， medium， and large plants</li><li>Incorporates a hexagonal design that enables you to pack many PowerGrower Eco Modules together with close spacing</li></ul></div><img src="http://ecx.images-amazon.com/images/I/51IxBNonTqL.jpg" noproxy>