Close your Shutters completely and you'll find that not only do they give maximum privacy and security, but that they also help to filter out external noise to create a cosy haven indoors.
For flexibility, you can adjust the position of the louvres to let varying amounts of light in, choose a tier-on-tier style which lets you open the top set while keeping the bottom set closed for privacy, or of course fling your Shutters open altogether if you wish - they still look stunning when folded back against the wall.