An energy harvesting device which can produce electrical power from vibrational energy over a wide range of frequencies and a method using the same are disclosed The energy harvester (10) includes a housing (20) having opposing slots (22) A bendable substrate (30) is at least partially positioned within the housing (20) and at least extends through the opposing housing slots (22) A piezoelectric element (40) is positioned on the bendable substrate (30) and a weight(50) cooperates with the bendable substrate (30) A stopper (60) is positioned on each end of the bendable substrate (30) that extends outside the housing (20) The stoppers (60) are configured to maintain a portion of the bendable substrate (30) within the housing (20) such that the bendable substrate is freely movable within thehousing (20) Vibrational energy causes collisions between the bendable substrate (30); and the housing (20) such that the forces on the piezoelectric element (40) generate power.