Edwards EST SIGA-MCC2 UIO Dual Signal ModuleThe Edwards EST SIGA MCC2 intelligent addressable dual input signal module is the UIO plug in version for Signature Series loops, used to switch two supervised Class B, or one Class A, 24 Vdc NAC, 25 or 70 VRMS audio, or firefighter telephone risers to their power sources under command of the loop controller. It uses a single address with factory set Personality Code 7 for both circuits, supervises field wiring for opens and shorts, and snaps onto UIO