P-US48 – Anti-spy Ultrasonic Voice Silencer with Remote Control
869.33$

This concealed recorder suppressor uses 48 circular transmitting units to achieve 360° ultrasonic interference without dead angles, accurately interfering with mobile phones, recorders and other sound pickup devices, while blocking 4G calls, WiFi and other signal channels, shielding the entire link from recording to data transmission.

https://www.thejammerblocker.com/p-us48-anti-spy-ultrasonic-voice-silencer-with-remote-control/