Pentair 521891 Black iS4 4-Function Spa-Side Remote Control with 50' Cord 5 VDC. The iS4 spa-side control can be used with the Pentair IntelliTouch, EasyTouch control systems and the Compool CP series control systems to provide remote switching of four control circuits from the spa location. It is typically used for activating spa circulation and three auxiliary pieces of equipment (such as lights, jet pump, air blower, etc.). One iS4 spa-side control can be installed per control system. It is possible to install two iS4 remotes on a single control system, however, the two iS4 remotes will mirror each other in functionality. The iS4 spa-side remote is a double-insulated device UL and ETL listed to UL 1563. It is splash-proof and weatherproof but should not be permanently submerged below the spa water level. The iS4 remote must be installed above the highest sustained water level.