The game's collection data lists Jumbotron Power Belt as sold by a vendor NPC in Dalaran.
Vendor
Zone
Map
Waypoint
Other items it sells
NPC #69971
Dalaran
-
-
162
Vendor NPC, zone and position come from the client's collection source tables (CollectableSourceInfo and CollectableSourceVendorSparse); coordinates are the in-game map readout.
Build history
First seen in build 5.5.4.69585 (Mists of Pandaria).
Read from the World of Warcraft client build files (JournalEncounterItem, JournalEncounterCreature, Achievement) and the Blizzard Game Data quest API.
How Jumbotron Power Belt Compares
Who It Suits
Plate is the armor type Death Knight, Paladin and Warrior wear. With Strength or Intellect, Jumbotron Power Belt suits Arms, Fury and Protection Warrior; Holy, Protection and Retribution Paladin; Blood, Frost and Unholy Death Knight.
Transmog Sets
Jumbotron Power Belt is part of the transmog set Earthen Battleplate (Warrior only). The other 16 pieces:
1 other item in the current build is also called Jumbotron Power Belt. Same-name entries are usually a different rank, faction, quest stage or reward track of the same object.
Blizzard numbers items as they are created, so the named items next to ID 59117 (59112 to 59122) were usually added in the same batch as Jumbotron Power Belt: the same quest line, zone, vendor or reward set.