This paper deals with possibilities of modeling a vibration energy harvesting device in the field of telecommunication appliances. The vibration energy harvester uses an ambient energy of a mechanical vibration and it provides an autonomous source of energy for wireless sensors or autonomous applications. A model of energy harvesting system excited by measured mechanical vibrations is created. The instantaneous output power and the total electrical power generation are calculated. The results confirmed the possibility to use the technology of Energy Harvesting from vibrations to capture electric energy from vibrations.