A method and apparatus to balance the brain left side and the brain right side by using binaural beat is disclosed. These systems can include large or small private branch exchange, key systems and equivalents, or Voice over Internet Protocol Call Management Servers. For this purpose, the charger and the two charge coolers are inserted in a common housing which surrounds the charger and the two charge coolers at least on the bottom side and on two opposite sides. The inner surface is connected to the outer surface by the proximal edge. R1R22SiO\u2014L\u2014SiR1R22\u2003\u2003R3R4nSiX\u2003\u2003R53SiO\u2014n-SiR53\u2003\u2003. In some embodiments, user interfaces may be used to allow users to manage application permissions without requiring the user to understand specifics of background applications, but rather by providing a predetermined threshold number of permissions that the user can assign to applications.