Energy harvesting from ambient energy sources offers an obvious, sustained, and unlimited method for powering small-scale and low-power systems. These technologies are of great importance for powering sensor and actuator nodes in wireless sensor networks, mobile devices, portable and implantable systems. At present, energy scavenging from mechanical oscillations is considered to be one of the most promising lines of research. The main challenge in designing vibration-energy harvesting devices is that most of useful vibrations, such as human motions, are in the lowfrequency range (1 – 30 Hz), whereas the maximum efficiency of most harvesters described in the literature is achieved with high-frequency vibrations of the order of 1 – 5 kHz. Several frequency up-conversion technologies [1-3] have been proposed for increasing the output power of energy harvesters for low frequency applications.  In the present paper, a new type of vibration-energy harvesting device [4] is proposed and investigated. The harvester comprises a fixed base and a moving transducer connected to the base with elastic elements. The transducer is a stainless steel membrane with a piezoelectric element and seismic mass, both fixed at its central part. The base is exposed to ambient low frequencies mechanical impulses, the transducer hits the base, and generates the AC voltage at the natural frequency of the moving transducer oscillator. This device effectively converts low frequency mechanical vibrations into electrical voltage. As it follows from Fig. 1, the energy harvester provides considerable output power over a wide region of low excitation frequencies. The lower (~ 4 Hz) and higher (~ 17 Hz) limiting frequencies are determined by the bandwidth of the mechanical arrangement and the materials of the transducer. Achieved characteristics of the device show the prospects of the chosen design for powering mobile devices and sensor systems.    The work was supported by the Russian Foundation for Basic Research, grant No 15-32-70006. We thank Mr. Alexander Zistler for performing preliminary measurements.