An electric power generating and gaining device using sound waves and photic energy to generate magnetism together using a crystal microphone device providing a metallic film with metallic coil leading wires to sense and receive the frequency of external sound waves and pressure to form a vibratile magnetic field (N and S poles), using the magnetic field and leading wire thereof and the leading wire and coil magnetic field (N and S poles) of the solar cell to mutually cut to form electromagnet.