About the main system: Programmable controller for Ocean Light/ECOplant LED lighting - Two independently programmable/dimmable channels for white and blue LED lighting (sunrise, sunset, and moonlight). - Optional Y cable available, allowing control of multiple Ocean Light/ECOplant LED lighting units simultaneously. - Programming is done through the Ocean Light LED timer control interface. - Power (24V low voltage) is supplied via the Ocean Light/ECOplant LED connection on the lighting unit itself, no additional power source needed. Dimensions (L x W x H): approximately 90 x 50 x 18 mm / 3.5 x 2 x 0.75 inches Cable length: approximately 1800 mm / 70 inches