Sundance Spa Circuit Board 6600-059 Rev. 4.00 (1997 - 1999). Replacement for the following models. 1997 Calypso I 750, Calypso II 750, Montego 750, Rio 750, Tango 750. This item is in the category "Home & Garden\Yard, Garden & Outdoor Living\Pools & Spas\Spas & Hot Tubs". The seller is "a-1spacontrol" and is located in this country: US. This item can be shipped to United States.