A formation monitoring system includes a casing. Call detail records for calls on a per call basis both in the wireline local and long distance setting and any wireless setting are assembled at a telecommunications service provider billing system for preparation of periodic billing to a subscriber. The foam body is formed in a cavity of the first casing and is bound to the first casing and the second casing. The program code can be configured to determine a power differential as a difference between the node power consumption and an upper power consumption threshold of the node. The Residence Time, the length of time the device remains on the mucosal surface before complete erosion, can be easily regulated by modifications of the backing layer. Then, the semiconductor chips are singulated from the wafer.