Per set includes a electric controller, a control panel and a heater 1) plug-and-play mode is to get the easy operation and easy installation. 2) three working modes: normal mode, economic mode and filter mode. 3) the clock display and setting of circulation-cleaning for 24 hours 4) synchronous changing color with multiple lights and fixed color light and ozone antivirus system. 5) automatically anti-freeze 6) double color buttons backlighting e) overcurrent protection 12) overcurrent protection of circulating pump 13) error code hinting Ctn size: 45¡á27¡á28cm(2set/ctn)