A long-period weak-motion inertial sensor includes a frame having a frame mounting surface, a movable mass having a movable mass mounting surface, a transducer for sensing displacements of the movable mass with respect to the frame, and a monolithic flexure element for suspending the movable mass in the frame. For receiving services, the service user apparatus transmits the signed-personal information stored there into a service provider apparatus. voltage source to one or more D.