Neptune Systems Apex Display ModuleThe Apex Display module is a sleek and compact way for your to interact with the Apex Base Unit and control nearly every aspect of your Aquarium. Mechanical, not membrane keypad Our Display Module uses high quality, mechanical buttons. So what you say? Well many devices out there make use of what are called capacitive touch pads. This type of membrane button is just fine for your toaster oven, but in a saltwater environment it is highly susceptible to