If you prefer to see who is trying to enter your premises, then you can employ a video door entry system.
A CCTV camera connected to your door entry system and linked to a monitor, computer (on a network) or your mobile device can help you to decide who to allow access to even if you are away from the building, ideal for deliveries if you have a safe place to store your parcels. Some of these systems can integrate with existing CCTV and phone systems to further reduce infrastructure works.
Whatever you are looking for in regards to door entry systems contact CCSS, we have a large number of manufacturers to choose from to ensure you have a system that totally meets your needs.