A composition for filling an ion exchange membrane including a first aromatic vinyl monomer having a halogenated alkyl group or a quaternary ammonium salt group, a method of preparing the ion exchange membrane, an ion exchange membrane prepared using the method, and a redox flow battery including the ion exchange membrane. The progressive bonus apparatus receives score contributions from each game unit to increase a progressive score. 8, and Y is the number of carbon atoms in the oxycarbonate. The integrity signal is based on the over-the-air transmission signal received by the receiver.