WaterBot is a persuasive water conservation device that presents �just-in-time" context-sensitive feedback to users. Its goal is to motivate behavior change regarding water conservation while using the bathroom sink. The system collects water usage information from flow sensors and presents subtle prompts at the point of behavior. These prompts are designed to be unobtrusive in the form of illumination, graph bars, and auditory feedback. WaterBot uses several persuasive techniques, such as law of contrast, positive reinforcement, variable schedule of reinforcement, social validation, scarcity, curiosity, and challenge. The demonstration includes a video showing its different behaviors while installed on a sink.