A system and method for determining the position of people andor objects, whether mobile or stationary, is presented herein. The liquid lens cell consists of four parts: a clear distensible membrane, a transparent wall member, liquid with a fixed volume stored in lens cell chamber, and an annular periphery sealing ring. The amino terminal methionine of the protein allows for recombinant production in a bacterial host cell. The change in the vibration characteristic can be used to determine the change in the environmental condition. The balancing device is embedded in the inside of the body of the blade in such a manner that it does not open to the outside of said blade. In some embodiments the bottom wall has a broad curved shape.