Devices in the sense of this category are objects that can't be carried, but that can affect gameplay in some way, usually when the player uses them.
“In some locations you may find a "Secret Switch", they will usually open up an area for you to...Secret Switch
“Charr Prison Locks can be found in the Cathedral of Flames (during Warband of Brothers). They...Charr Prison Lock
“Boss Locks are part of GW:EN dungeons. It controls a door that blocks the way to the boss of...Boss Lock