The expanding publicity of problems, concerning the environment protection, could rise the energy harvesting technology (in this particular case sound pressure is used) using MEMS to a promising method for low voltage system supply. This will avoid the use of disposable batteries and the need of recycling. The increase and development of portable electric devices having smaller and smaller mass, extends the necessity of highly effective energy sources to supply them. With the creation of technology and devices, which will be able to convert and store the energy from the surrounding environment, the question for excluding batteries as a main source supplying low power consuming devices arises