Electronic locks are becoming more of the norm for customers to have installed on the entry doors. It give more control over access and reduces the key quantity carried. If they are what your wanting be sure to install a quality lock like that if the Lockwood 001 Touch Digital. It builds on the already proven 001 deadlock that has been used to secure so many houses in Australia and adds the touch screen and proximity cards but no external locking cylinder. Easily programmed by the end user, it gives more options than the standard key will ever do. They are a great way to ensure your property stays safe when your not home. The retail price of the lock is around $330 which is costly but you also get a 25 year mechanical warranty and most locksmiths in Australia will recommend this above all other offerings.