Device for detecting the activity of persons or the state of infrastructures or objects influenced by persons, by means of acceleration measurement, - wherein the device has at least one acceleration sensor (1.3.1) for measuring an acceleration, - wherein the acceleration sensor (1.3.1) is designed to react on a predefined threshold value of a measured acceleration, and to trigger at least one of the following actions when the threshold value is exceeded: - data storage, - modification of a counter, or - sending a data telegram per radio, and - wherein the device has an energy converter (1.1) for converting a primary energy into electric energy for operating the device or the acceleration sensor (1.3.1), wherein the energy converter (1.1) is designed to obtain the primary energy independently from an energy resulting from the measured acceleration, - wherein the device has an energy storage facility (1.2.2) designed to store the electrical energy converted by the energy converter (1.1) from the primary energy, wherein the energy storage facility (1.2.) comprises a first energy storage facility (1.2.2.1) and a second energy storage facility (1.2.2.2), wherein the first energy storage facility (1.2.2.1) has a higher storage capacity than the second energy storage facility (1.2.2.2), and wherein the second energy storage facility (1.2.2.2) has a lower internal resistance than the first energy storage facility (1.2.2.1), and wherein the first energy storage facility (1.2.2.1) and the second energy storage facility (1.2.2.2) are designed to store the electrical energy converted by the energy coonverter (1.1) from the primary energy. - wherein the device has at least one acceleration sensor (1.3.1) for measuring an acceleration, - wherein the acceleration sensor (1.3.1) is designed to react on a predefined threshold value of a measured acceleration, and to trigger at least one of the following actions when the threshold value is exceeded: - data storage, - modification of a counter, or - sending a data telegram per radio, and - data storage, - modification of a counter, or - sending a data telegram per radio, and - wherein the device has an energy converter (1.1) for converting a primary energy into electric energy for operating the device or the acceleration sensor (1.3.1), wherein the energy converter (1.1) is designed to obtain the primary energy independently from an energy resulting from the measured acceleration, - wherein the device has an energy storage facility (1.2.2) designed to store the electrical energy converted by the energy converter (1.1) from the primary energy, wherein the energy storage facility (1.2.) comprises a first energy storage facility (1.2.2.1) and a second energy storage facility (1.2.2.2), wherein the first energy storage facility (1.2.2.1) has a higher storage capacity than the second energy storage facility (1.2.2.2), and wherein the second energy storage facility (1.2.2.2) has a lower internal resistance than the first energy storage facility (1.2.2.1), and wherein the first energy storage facility (1.2.2.1) and the second energy storage facility (1.2.2.2) are designed to store the electrical energy converted by the energy coonverter (1.1) from the primary energy.