The Green Pressure Plate is a variant of Pressure Plate, characterized by a green top. It is used as a switch, and may be connected via Wire to other mechanical items. Whatever it is connected to will be activated when the switch is stepped on. They can only be purchased from the Mechanic, but they can also be found in the rock layer underground, or in Dungeons. File:Terraria - Red Wire Traps Tutorial Terraria HERO