Telephone entry systems are great for new installations as well as replacing outdated intercom systems. The operations is very simple and self contained. The visitor simply selects the tenant they are visiting from the LCD crystal display. The telephone entry system then dials the tenants home or mobile phone. The tenant is then able to speak with the visitor and if they decide to grant access with a push of a button on there phone the door is unlocked. This is also a great choice for off site managers and emergency access.