The PKI 6690 Jammer against Microfons and Recorders is indispensable in both the civil and military sectors. It is based on the system for generating interfering signals that change variably in time. The PKI 6690 Jammer against Microfons and Recorders effectively protects against eavesdropping and recording devices such as mobile phones, recorders etc. Confidential conversations, especially during conferences, can therefore not get outside and be made accessible to everyone. For most people, the interfering signal from a distance of one metre to the PKI 6690 Jammer against Microfons and Recorders is practically inaudible. The built-in rechargeable battery allows an operating time of 6 hours. The camouflage in the microphone minimises detection and can be used mobile anywhere. The PKI 6690 Jammer against Microfons and Recorders effectively blocks most of the various hearing aids at an average distance of approximately 0.5 – 3 metres.