An enhanced stability crane is described. The at least one service provider is arranged to provide the charging node with charging information and the charge node is arranged to determined a charge associated with the service. The second charge storage layer includes a third memory section and a fourth memory section. The invention optimally provides an audio output signal that is sufficient for private, room or group use. The back pack further includes a number of arcuate or curved panels which are joined together by fasteners to provide multiple access openings to the back pack through the top side thereof. The perimeter wall may be positioned in funnel position extending upwardly from the threaded neck or in a nipple receiving position extending downwardly from the threaded neck.