The APEX DISPLAY MODULE is a sophisticated and convenient way to manage the operation of your aquarium using the APEX BASE UNIT. It is equipped with high-quality, mechanical buttons for durability, even in saltwater environments. Its adjustable contrast and high-resolution, backlit graphical display offers effortless readability. Additionally, a built-in speaker produces multiple alarm tones to alert you of potential leaks or other conditions you program into the Apex. Up to three Display Modules can be connected to the Apex Base Unit, all with full functionality.