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The pervasive use of smart speakers has raised numerous privacy concerns.While work to date provides an understanding of user perceptions of thesethreats, limited research focuses on how we can mitigate these concerns, eitherthrough redesigning the smart speaker or through dedicated privacy-preservinginterventions. In this paper, we present the design and prototyping of twoprivacy-preserving interventions: `Obfuscator' targeted at disabling recordingat the microphones, and `PowerCut' targeted at disabling power to the smartspeaker. We present our findings from a technology probe study involving 24households that interacted with our prototypes; the primary objective was togain a better understanding of the design space for technological interventionsthat might address these concerns. Our data and findings reveal complextrade-offs among utility, privacy, and usability and stresses the importance ofmulti-functionality, aesthetics, ease-of-use, and form factor. We discuss theimplications of our findings for the development of subsequent interventionsand the future design of smart speakers.

PowerCut and Obfuscator: An Exploration of the Design Space for Privacy-Preserving Interventions for Voice Assistants