Installing the Kwikset - SmartCode 917 Traditional Electronic Door Lock and Lever set was extremely easy for anyone that has installed a door lock before. I installed this lock on an interior office door for extra security while away from home . The guide was was helpful with setting the codes. Again very easy setup. Although it holds 30 codes we only use one but this option is nice if you plan to use  on an exterior door . It has a great back light , making it easy to read in the dark. I really like the design and being able to change the direction of the handle. Great battery life.  It’s quality made and is very sturdy. Awesome upgraded security. Will be purchasing a few more for exterior doors.