Topside - Balboa MVP260, 4-button Digital w/o overlay (#53999) Requires either #7509 (Aux, Jets, Temp. Light) or #7510 (Jets, Light, Up, Down) Overlay - (Not Included) Same as Part #55051 (with overlay) Used in Pinnacle Swim Spas Used on Fits Go Spa Models : 620, 624, 626, 630, 631, 632, 633, 643, 742 Used on Premium Leisure Fitness Series Spa Models : Endurance, Stamina, Vitalizer, Duex, Sol Used in Pinnacle Swim Spas