An electromechanical transducer of the invention comprises a structural unit, an armature, and first and second elastic members. The present invention performs authentication by using time-series data including both physical characteristics such as a fingerprint and behavioral characteristics such as \u201cmovement\u201d obtained by sliding a finger on the device. When the over-programmed bits in the primary array are erased, the error documentation memory array is erased as well, deleting the documentation data relating to the over-programmed bits.