... of lock, after a tick and the LED flashes in green, the lock is unlocked, touch the Mother Card lightly ... lock again, after a tick and the LED flashes in green, touch the RF card which you want to ... of lock for 2 times successively, the LED flashes in green, touch the Child Card which you want to delete ... of lock for 3 times successively, the LED flashes in green, after 3 short tick all of the Child Cards ...