DHI-DSS4004-S2

"One video channel license for DSS Express V8, no prerequisite. Note: It can support up to 65 video channels by purchasing one video license."

"One access control channel license for DSS Express V8, no prerequisite. Note: For access control devices with video channels, the video channel license is required."

"One attendance management module license for DSS Professional V8. Prerequisite: Access control channel base package. If there are more than 16 access control channels, the corresponding number of access control channel expansion license is required."

One video intercom device license for DSS Professional V8, no prerequisite, supported video intercom devices include VTO, VTH, VTS, etc.