Neptune Systems Variable Speed Dimming Module (VDM)Product Includes:- Variable Speed Dimming Module (VDM)- 3-foot AquaBus Cable- 2 x Built-In AquaBus Ports- 4 x Built-In Variable Speed Ports- 1 x Built-In AquaIllumination Serial Port- LED Status Indicator Light- Owner’s ManualProduct Highlights:1. Control AquaIllumination LED Light Systems: Simulate Sunrise-Sunset, Lunar Cycle, Cloud Cover and Lighting Storms and independently control the white and blue LED’s. (Interface cable sold separately.)2. Dimmable Light Control: Variable speed, 0-10 Volt ports can be used to control dimmable lighting equipment such as dimmable T5’s and LED’s. (Interface cable sold separately.)3. Variable Speed Pump Control: Directly control up to 4 Tunze stream pumps. (Interface cable sold separately.)4. Plug and Play: Automatically recognized by the controller when installed.5. Flexible Expansion: Built-In AquaBus ports allow for flexible and easy expansion.6. Easy Software Upgrades: Download updates and new features directly from the web.7. Compatibility: Can be with used with Apex, Apex Lite and Apex Jr aquarium controllers.8. Warranty: 1-Year Manufacturer's Limited Warranty.