A golf ball having a cured polyurethane cover which includes an isocyanate group terminated polyurethane prepolymer comprising a specific alicyclic diisocyanate as a polyisocyanate component, and a specific 4,4\u2032-diaminodiphenylmethane derivative as a curing agent. The controllers are connected with each other through the communication bus. The tip ends of the actuators are fixed to a driven member.