A putting system with a putter substrate and modules that detachably couple to the putter substrate to form a putter head is disclosed. The shift register includes a plurality of stages for sequentially outputting scan pulses in such a manner that high durations of the scan pulses partially overlap with each other. An entity identifier may be a telephone number, electronic mail address, network address, name or virtually any other indicia that may serve to identify the entity. A method of operating the water dispenser is also disclosed. Systems include signal source arrays in optical communication with optical trains that direct excitation radiation to and emitted signals from such arrays and image the signals onto detector arrays, from which such signals may be subjected to additional processing.