Clicking the center of the decor will dispel the void portal, while clicking on the rocky edge will activate it.
Like Engineering wormhole generators, the endpoint is completely uncontrollable and random, chosen from more than twenty locations, all of which have some connection to the void. Because players have no control over where they will end up, making this decor more of a novelty than any kind of actual convenience, adhering to Blizzard's previous philosophy that decor may have functions like furnaces, anvils, or cooking fires, but they won't provide any power or convenience normally found in capital cities - no quick-access Auction House, banks, or profession trainers.
When placed at your house, the Maw will teleport players to random void-related locations.
While the random portal is more likely to waste time than to save it due to the return trip to your house, there is one loophole that players can take advantage of. Players can teleport to a friend's house repeatedly with no cooldown, so using the Maw from their home and teleporting back again if you do not like the result will allow you to use it again and again.
This is highly circumstantial though, as the odds of actually being taken where you want to go is so low that you would save more time simply going to the desired location yourself.
Azj-Kahet - The Maddening Deep
Ahj-Kahet - City of Threads hidden cave
Eredath - Triad's Conservatory
Grizzly Hills - North of Grizzlemaw
Howling Fjord - Whisper Gulch
Isle of Quel'Danas - Magister Terrace overlook
K'aresh - Rock outcropping north Manaforge Omega
Uldum - Ramkahen
Mount Hyjal - Seat of the Chosen
Nazjatar - Gate of the Queen
Netherstorm - Manaforge Ultris
Shadowmoon Valley (Draenor) - Shadowmoon Burial Grounds
Silithus - Ruin's of Ahn'Qiraj
Stormsong Valley - Crucible of Storms
Storm Peaks - Ulduar
Tanaris - Caverns of Time, Dragon Soul
Tirisfal Glades Twilight Camp, NW of the zone
Twilight Highlands - Bastion of Twilight
Vale of Eternal Blossoms - Summer Fields
Voidstorm - Voidspire entrance
Voidstorm - Nexus-Point Antius
Zul'Aman - the Strait of Hexx'alor
