The 2N IP Uni 1 button - 9153101 is a SIP Intercom which provides a cost effective solution for access control and communication. It offers full-duplex audio with echo cancellation, integrated relay for door entry systems. 2N IP Uni 1 button 9153101 is ideal for schools, parking lots, shopping malls, hospitals or public buildings. It can be used as an information/emergency help point or as a door entry system.