24V, 500 mA Linear Wall Wart for use with Dispatcher/Operator and EBF31A.  Note these use the same 2.1mm barrel plug as many 5 and 12 V supplies so please label the plug so as not to damage other equipment.  We try to keep a few around for our "project" customers, and you can do better shopping around, but we sell them as a courtesy to those who want to combine shipping or have "one throat to choke."  Note this is set up as a positive supply (traditional phone guys be warned).