Two predictions for the spin down behavior of magnetar SGR J1745-2900

The basic concepts of wind braking of magnetars, and its applications to various timing events of magnetars are outlined. The case of the Galactic centre magnetar SGR J1745-2900 is especially discussed. Two predictions for SGR J1745-2900 are made (the period derivative will first increase then decrease; and possible outbursts in the near future).