The Whelen pccs9lw is a programmable low current control switch center for use with new wecan series light bars,edge® 9m, edge® ultra lc,edge® freedom, lfl liberty lc and other lightbars switching. bars that utilize high switching, pccs9r. four position slide switch, five pushon push-off switches momentary push on-off switch. pccs9 are 4 position, 3 level different colored led indicators separate primary warning controls. auxiliary input on 3. one of most popular boxes in service today used thousands emergency vehicles worldwide.