This is the Jacuzzi 6600-720 PCB specifically designed for Sundance LED systems without circulation pumps. It replaces models 6600-087, 6600-046, and 6600-287. This circuit board is suitable for two-pump systems only. If the system features a circulation pump, the recommended alternative is the 59-455-2008 board. Jumper settings on the board allow for customization based on system requirements.