Interlocks Interlock controller Interlock:2 DOOR Programmable R3,039.29 Interlock:2 Door Supervised Include Battery Backup R2,571.65 Interlock:3 Door Supervised Include Battery Backup R2,688.82 Push button station Push Button Station:2 Doors + Evacuate R878.44 Push Button Station:3Door+Evacuate R1,151.01 Add-ons for the Interlocks Door Status Green LED light RAFI R117.88 Door Status Red LED Light R117.88