An energy efficient cooling system that employs liquid air in order to eliminate potentially harmful effects associated with some refrigerants with regard to both humans and the environment. The composition comprises a zeolite which is modified to introduce zinc by hydrothermal ion exchange. A control unit controls the memory banks in the accumulator memory so that each time the operation is performed, an operand is provided from one of the memory banks and a result is stored in the other memory bank. The value V may then be exclusive ORed with a data value that forms a portion of the information being encrypted. The pallet is used within a leasing system andor an inventory management system.