An electrophysiology catheter includes a tube having a proximal end, a distal end, and a lumen therebetween. In effecting tracking servo by 3-beam method, auxiliary light receiving domains D3\u20141, D3\u20142, D8\u20141, D8\u20142 are provided. Further optional, a cover plate over the structure for enclosing the control circuit secures the control circuit and provides a single-receptacle connection to the vehicle. The bellows may include an aperture which must be covered when the game call is used. One character string represents a telephone number and the other character string represents an e-mail address.