A number inventory system is disclosed. The external unit is, for instance, a hearing device remote control. The interface communicates the inputted parameter to an engine of the loyalty program. A set of read data values from a second set of DRAM locations corresponding to the read CAS address, are received with reduced turnaround time after asserting the complete set of write data values. One of such propellers may be mounted below a forward portion of a vessel and a second below a rearward portion, each propeller being pivotable outwardly in opposite directions from the longitudinal axis of the vessel to enable the vessel to turn more rapidly from one direction to another.