As each PoweredUSB plug provides one of three voltages, the plugs come keyed in three versions, so that they will only accept connections from devices requiring that version's voltage. The connectors can be color-coded for different voltages: Gray (Pantone Cool Gray 1C) (sometimes also "nature" or yellow) for 5 V, blue-green (Pantone Teal 3262C) for 12 V, red (Pantone Red 032C) for 24 V/25 V and violet for 19 V; alternatively, any voltages higher than 5 V can be indicated by a black connector color.