During a fire every second counts in order to save your life. Smoke detectors can give you those precious seconds and let you escape from danger by warning you with a loud shrill or beep.
Smoke detectors are fairly inexpensive and easily installed.
You can purchase them from any home improvement store. Here I have some illustrations to help you understand the way a smoke detector is installed. Remove the factory installed battery, which is installed backwards to prevent activation. Drill holes in the circular areas that you have marked. Insert the plastic anchors that come with the unit, insert the screws so the heads protrude slightly from the ceiling or wall.