This surah has 25 ayaat and it was revealed in Makkah. The Holy Prophet (s.a.w.) has said that the one who recites this surah will not get his book of deeds from his back on the Day of Reckoning.
If written and worn by a pregnant woman, the delivery of the baby becomes easy. However, it is important that after delivery, this surah should be kept away from her. If this surah is tied on any animal (eg. camels or horses) then it keeps them safe.
May Allah increase us in knowledge!