The 6511 control base is a solid, bronze and stainless steel base for mounting control heads onto, allowing for switches, indicator lights or other button-based functionality to be added to a stand-alone control head. The 6511 is available with a 6 switch configurations and has an alarm built into the base.
The 6511 is compatible with the 6515, 6523, 6545 and 6555 control heads. Photo shown is of a 6511 base with a 6555 control head mounted.
Kobelt also produces alarm panels with part number 6511, be sure to clarify that the control base is required along with a control head, rather than a basic alarm panel.