| http://www.w3.org/ns/prov#value | - 25-4009 4009 System 5 Expansion Panel - Also called a "slave control unit - Connects to a master panel (25-4000) via 3 shielded wires - Increases total system capacity to 8 doors, 8 zones and 1 aux - All functions of the slave panel are the same as the master, except the master is used for all programming functions - Telecommunications Board (41-4021) not included nor required with slave expansio
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