The in.yj-V3 is outstanding for smaller hot tubs! A bestseller embraced by hot tub dealers, the in.yj-V3 is the most suitable control system for smaller hot tubs. We couldn't resist aiming higher and making it the best it can be with a new, boosted processor, more memory and larger capacity relays. It has the power to run new features: updated FLO circuitry, on-board LEDs for troubleshooting, and a dual-phase CE configuration so it can be used anywhere in the world. It will run: A two-speed pump and a single-speed pump or a blower A circulation pump and a two-speed pump A circulation pump and two single-speed pumps A circulation pump, a single-speed pump and a blower The in.yj-V3 is compatible with a wide selection of keyboards: Main: in.k8, in.k35, in.k200, in.k300, in.k336, in.k450, in.k500, in.k600 (the simplified interface only), in.k800, in.k1000, in.k2001 Auxiliary: in.k120 Dimensions Width: 308 mm Height: 186 mm Depth: 96 mm Important Notice: It is essential that all parts are installed by a qualified individual or tradesperson, adhering strictly to the applicable electrical and building safety regulations. Installing a part that is incompatible may lead to damage to both the part itself and other components within the system. Please note that such damages are not covered under warranty.