Electronic keypad by Master Spa. Designed For 2-3 Pump Systems. Master Spas started using in the Michael Phelps Legend Series in 2015. Currently used for the MS40 system. 9 button blank panel, this panel doesn't come with an overlay. There are multiple overlays that can go with this control panel. You must purchase overlay for complete functionality. See suggested accessories below for overlay replacement. Has 4 Pin Molex Plug w/ 7' Cord. This Keypad is Compatible with the following series/system(s) - Master Spa Proprietary MS40 Control Systems by Balboa. Also found in the following spa models - Master Spa Models (2014-2015) Michael Phelps Hot Tubs MP LSX 900, MP LSX 800, MP LSX 700, (2015) Twilight Series TS 67.25, TS 8.3, TS 8.2, TS 7.2, TS 6.2, TS 240, TS 8.35, TS 8.25, TS 7.25, TS 87.3.