Rare Find F-11 Anti Recording Ultrasonic Acoustic Sound Wave Generator Stop Microphone Recorder Smartphone Listening Device 70% Off - Today Only [KFHvuME6]

The F-11 ultrasonic acoustic sounds wave anti-recording generator guard emits low frequency ultrasound to interfere with microphones. This includes smartphone, tablet, digital recorder, listening device, camera microphones. It eliminates / interferes with any microphone used to monitor or record voices / sounds / audio.

Model F-11 is designed to place in room where and place as near to listening / recording device. Positioned between conversation taking place and microphone is best. 110v-240v AC mains operated and battery powered with 8-9 hours working time.

Place where sensitive or private conversation is to take place and switch on to emit ultrasonic acoustic sound waves that override microphones nearby.

The distance covered is up to 6 square metres over 360º coverage and more effective the closer it is to microphone. No voice/conversation or sound can be heard when used effectively. You may hear a mild hum when within 1 metre of generator and is tolerable. However long period use can become uncomfortable to some users. Not recommended to use with pets nearby as they can hear ultrasonic sound more clearly than humans.

The principle of the anti recording guard is to emit ultrasound acoustic sound waves to interfere with normal function of microphones. Its core technology is an advanced algorithm and chip which generate and run ultrasonic sound waves targeting sound frequency of speech. Resulting in 4 models of military grade ultrasonic generator anti-recording shield.

1. Anti-recording device / anti-eavesdropping device.
2. Easy to use: 5 output directions, two gears, shielding angle 360 degrees.
3. Working principle: Ultrasound acoustic wave interference
4. Application: meeting, Business interview, Personal communication, Confidential / private conversation.
5. Function: protect your privacy and prevent recording / eavesdropping.