Answer:
The unit is compatible with Hikvision 4-wire analog door stations (such as the DS-KB2411-IM series) and standard external analog/CVBS surveillance cameras. It supports cascading up to three indoor stations and connects to electric door locks via four-core cabling.
The Hikvision DS-KH2220-S is designed for 4-wire analog video door phone topologies. It interfaces with Hikvision 4-wire analog outdoor door stations (such as the DS-KB2411-IM and DS-KB2412T-IM series) over standard 4-core cable delivering 1-channel video input, 1-channel audio input/output, 1-channel power supply, and 1-channel grounding.
In addition to door stations, the indoor unit can interface with external CVBS/analog surveillance cameras for expanded entryway monitoring, as well as electric door strikes or locks for remote access release. For larger premises, the system architecture supports cascading up to three indoor stations connected within the same intercom deployment.
