A secondary battery including an electrode assembly; a case accommodating the electrode assembly; a cap plate covering the case; and an electrode terminal electrically connected to the electrode assembly, wherein the cap plate includes at least one bending induction groove at a periphery of a central portion of the cap plate in a region between an edge and the central portion of the cap plate. The apparatus acquires frequency selectivity information using a cell-specific reference signal, selects a channel estimation scheme using a user specific reference signal according to the acquired frequency selectivity information, and estimates a frequency channel using the selected channel estimation scheme. The semiconductor chip is provided on the lower magnetic shield member. In addition, the system allows for the inclusion of transactional information, including financial transactions, physical movement, asset deployment, or other acts or activities that may be related to, or independent of, the communications.