If I recall, some foam rubbers and some curtain materials absorb ultrasound. Can any confirm this?
If so wrap you home 'assistant' (alias spy device) in curtains.
Not a member of The Register?
Create a new account
Remember me on this computer?
The Register - Independent news and views for the tech community. Part of Situation Publishing
Join our daily or weekly newsletters, subscribe to a specific section or set News alerts
Biting the hand that feeds IT © 1998–2019