This Kwikset Uptown Deadbolt is great for exterior door security. I feel so much more safe since this deadbolt was installed. It was easy to install. 
I love the Smartkey technology for that added protection from potential break ins.
It has a turn piece on the inside to lock/unlock and has to be locked/unlocked with the key on the outside. Can also be re-keyed easily. 
I really like the low profile modern style.
I would recommend this deadbolt to anyone wanting that added security and safety.