AI wearables that capture audio are increasingly used for surveillance, prompting the development of counter-surveillance tools. In March, start-up Deveillance announced Spectre I, a puck-shaped device that claims to block recordings without requiring a physical search. The product was created by Aida Baradari after concerns about AI recorders used as personal assistants or therapists. The trend follows a long history of surveillance and counter-surveillance, from World War II radar countermeasures to earlier electronic jammers. Early jammers emitted white noise; newer models use ultrasonic frequencies that interfere with microphone hardware. In 2020, researchers at the University of Chicago mounted 23 ultrasonic transducers on a bracelet to broadcast jamming signals omnidirectionally. Advanced AI wearables employ speech-recovery algorithms that separate a target voice from background noise, a capability also being pursued by Microsoft in its Deep Noise Suppression Challenge and by other firms for phone and podcast applications. These algorithms rely on large datasets of speech to reconstruct missing syllables, making them difficult to defeat with simple jamming. Researchers propose supplying false data or noise as a countermeasure. Historian Finn Brunton and privacy scholar Daniel Howe suggest feeding algorithms with decoy inputs. In audio, Woodrow Hartzog notes that defense attorneys once used babble tapes with layered voices to mask conversations. In 2023, a team led by Ming Gao developed MicFrozen, which listens to a speaker's voice and emits ultrasonic anti-speech to confuse reconstruction algorithms. Baradari said Spectre I may also detect nearby microphones, though details are pending. While Spectre I and similar tools aim to protect privacy, AI models continue to improve, potentially bypassing current countermeasures by reading lip movements or analyzing vibrations in objects. The arms race involves powerful corporations and organized crime, which have historically used encrypted communications and burner devices to evade surveillance. The outcome remains uncertain as the technology evolves.