spa control system: 1.CE.FCC,ROHS EUROPE and USA STANDARD. 2.110V/ ... to 10 channels.5,87 shows the volume and volume adjustable.6,Long cycle time cycle of cleaning and cleaning function ... function.11,Backlight function keys.12,Board computer function key lock.13,Three-phase or single phase, optional 110-120VAC or ... Power 20W 3) Speaker 8Ωdamp proof speaker spa control system