Just bought this little key pad and I have had it a little over a month.It only took a min. or two to install. I put the first screw in(top one), screwed it in until the pad was snug against it. With the battery out put in the second screw. Viola!!! Just be sure to do the key pad codes before hand. It has already saved me several steps as I have trouble walking. Not counting the time it has saved me, my GF and kids. Would HIGHLY reccomend this product. Less than $25.00 to get it to my front door.