Plug and Play: Like all AquaBus accessories it is automatically recognized and configured by the Apex Base Unit. Expandable: Multiple Display Modules can be used with the same Apex Base Unit providing full user interface and complete functionality at remote tank or equipment locations. Each Display Module has the same functionality as the primary Display Module. Sleek and Stylish: 128 x 64 backlight display with sharp blue background and high contrast white characters. Includes the ability to dim the backlight at night. Easy To Use: Quick, intuitive and flexible menu navigation with 7 straight-forward interface buttons. Customizable: Four unique home/status screens that can each be independently configured with the ability to automatically or manually scroll between each of the different screens. User selected placement of probe names and icons. Data on Demand: Ability to display data log graphs at the touch of a button. Audible Warning System: User selected ring tones and songs provide unique warning for each type of system error. Easy To Install: Compact case with mounting holes for easy attachment to stand or wall. Warranty: 1-Year Manufacturer's Limited Warranty.