The Divine Mercy is a form of God's compassion, an act of grace based on trust or forgiveness. In Catholicism, it refers specifically to a devotion which had its origin in the apparitions of Jesus Christ reported by Faustina Kowalska, in the early 20th century, in Poland.  A scapular includes and crucifx and St Benedict Medal and they have been blessed with a special exorcism prayer.   You can wear this visably around your neck on tucked in your shirt.   They can be hung around the house and car too.