Each of the devices with a voice assistant has a built-in listening system; they are everywhere – in space or at home. Everything is done to make our lives more comfortable, not to write queries, but to give the command in a voice. Initial excitation related to smart devices weakens and, on the contrary, becomes annoying when we are aware that we are overheard, recorded, or our confidential data is saved. That is why, in the era of intelligent devices, it is essential to protect users against potential threats. A device that looks like a bracelet was created, with 24 small speakers emitting an ultrasonic signal in the 24-26 kHz band. The signal is strong enough to disturb the microphones in the device. However, it can be irritable to our pets. The prototype is quite large, but it will be minimized in the future to make it look more delicate.