I/O Expansion Board (no box) - Onboard Capacity: (8) 1A Rated Relays and (8) Analog Inputs (supervised or non-supervised), tamper switch connection (assembly sold separately VLOCKRI). Power Requirements: 1A @ 24 VDC minimum power supply (sold separately). Can be powered locally with the SMS Power Supply or via the VRCNX-A via RS-485 protocol.