The NRS103WH is a retrofit for 3-wire intercom systems. It will allow communication with all other stations and can fill your home with music. You have complete control over the system, even if you can’t be near the ‘Master’ station. Talk from any station to all other stations and the ‘Master’ for total communication throughout the household so everyone can be connected by just touching a button. Answer the door from any remote station to eliminate running for the ‘Master’ – or the door, providing you with total convenience because you’re always able to monitor the situation.