The Gecko IN.YJ3 spa pack control box main unit is a reliable and efficient control circuit board designed for spas and hot tubs. it offers customizable settings to meet your specific needs. This unit is compatible with the IN.YJ2 heater and is designed for use with 120/240VAC 60Hz systems. Made in Mexico by the trusted brand Gecko, this control box is a crucial component for maintaining and operating your spa or hot tub with ease and precision.