electrical energy is produced at a remote site by converting kinetic energy from the environment . the kinetic energy may include vibrations and flow of fluid . in some embodiments the kinetic energy causes magnets to move with respect to coils in order to produce electrical energy . an anchor holds the device in place , and permits the device to be retrieved or relocated . a flexure or compliant membrane that helps determine the position of the magnets with respect to coils is defined by mechanical properties that permit oscillatory movement in response to the inputted kinetic energy . the device can be tuned to different vibration and flow regimes in order to enhance energy conversion efficiency . further , the device may be mounted in a secondary flow path such as a side package or annular tube .