Honeywell Keyboard Display Module, 13Vdc Peak Fullwave Rectified Voltage, English Language, -40-140 Degree Ambient Temperature Range, Provides Current Status of Burner Sequence, Timing Information, Hold Information and Lockout Information, Capable of Displaying Special ” Call Service” Messgaes, Allows Setup of S7830A1005 Expanded Annunciator Messages, Used for VPS Programming and Programming Post Purge on Select 7800 Devices