SKLZ Golf Accelerator ProThe Accelerator Pro indoor putting green comes with an automatic ball return. You will practice on its true roll surface with a stimp reading similar to real greens. Precise alignment guides at 3, 5, and 7 feet assist every aspect of your putting motion squaring the face, backswing, and follow through for greater accuracy and distance control on every putt. FEATURES Develops accuracy and control with squaring and alignment guides at 3, 5, and 7 feet