This is a great system. It is very easy to install the directions are very clear. it is very easy to program, you can program up to 30 codes. It fit the door perfectly one hole door.We have had 5- 10 degree weather the last week and I have had no problems with the unit freezing. It is visually appealing very nice finish. The keypad lights up when using so easy to use in the dark.   The smart-key technology is bump proof, pick resistant and drill resistant, so very secure.It has a very sturdy commercial grade lever. This is an excellent door system,  I like that even when the door is locked you can open the door on the inside, without unlocking the door, this auto lock feature is great.  I highly recommend this product.