A. [Compatibility]: Perfectly designed for Hayward Universal H-Series Low Nox Pool Heater models including H150FDN/P, H200FDN/P, H250FDN/P, H300FDN/P, H350FDN/P, and H400FDN/P. Ensures a precise fit and function for optimal performance. B. [High Performance]: The FDXLICB1930 FD Series Integrated Control Board is a replacement for Hayward H-Series Low NOX Heaters. Suitable for models manufactured post-September 20, 2004, with model numbers ending in FDN or FDP. C. [Direct Replacement]: Engineered to meet or exceed Part Number specifications, this control board offers a seamless installation process. Replace old parts directly without any modifications for a reliable and stable performance. D. [Durable Material]: Constructed from upgraded materials for enhanced moisture resistance and durability. The robust design ensures a longer service life and dependable operation under various environmental conditions. E. [Energy Efficient]: Optimize the efficiency of your pool heater with this energy-efficient control board. It not only improves performance but also contributes to the overall energy management of your pool system. F. The product appearance and printed words may vary depending on the batch, but this does not affect use. G. Colour: Green H. Material: Electronic component I. Package Contents: 1 * FDXLICB1930 FD Integrated Control Board Replacement Kit J. Only the above package content, other products are not included. K. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.