The rapid evolution of electronic devices and integration technologies, together with the development of wireless systems, have been removing structural constraints and leading to the implementation of “smart” environments around us. Till date, battery has been the source of power for portable electronics. Due to the shortcomings of conventional batteries and their limited life span, devices are less reliable because they can stop working at any time without warning, and battery replacement is time consuming and costly, especially when the device is in a remote location. The demand has grown for a light weight power supply with low volume, high energy density, and a long lifetime. Energy harvesting techniques are the most promising alternative for powering low-power devices and storage reservoirs in response to this need. Energy harvesting, the collection of small amounts of ambient energy to power wireless devices, is a very promising technology for applications where batteries are impractical, such as body sensor networks and inaccessible remote systems. The performance and potential of energy harvesting devices depend strongly on the performance and specific properties of materials. Low power is needed for all hand held devices so that low vibration energy is enough to power these devices.