Kidde Ki-Rb Detector Mounting Base With RelayKidde KI RB Detector Mounting Base with Relay The KI RB is a Signature Series detector base. It connects the detector to the signaling line circuit (SLC), but does not support the GSA LED. The KI RB adds relay functionality to the listed compatible detectors. Specifications: Weight 0. 2 lbs Manufacturer Carrier Brand Kidde Condition New Type Detector Base Base Type Relay Construction Polymer Color White Series KI Series, Kidde Signature Series, KIR