Buying signals convey critical and timely information about the signaling entity, and signal sensors are the mechanisms that listen for and capture these signals. The B2B Buying Signal Sensor Design Schema defines the core components of signal sensor design and provides guidance marketers can use to design ubiquitous and actuated sensors. In this report, we describe the core components of buying signal sensors and how to design sensor mechanisms based on the source of the signal and unique signaling properties within the tactic set combined with audience interaction behavior.