The DS-KAD709 by Hikvision is an integrated unit that supports two-wire indoor and door stations. It is compact, convenient, and easy to install. Its two-wire interfaces and adaptive network interface can support up to nine devices, and one external switch.
Two-Wire Video/Audio Distributor
Supports Up to Five Two-Wire Stations (2 Outdoor Stations Maximum)
One 10/100M Self-Adaptive Network Interface to Support External Switch
24 VDC Power Supply and Communications between Door Stations and Indoor Station
Industrial Design and DIN Rail Mount Supported