This device can be inserted in a telephone line or between a tape recorder and the microphone, etc. This little device absolutely jams all listening devices. It is so effective that it will even jam some telephones and hearing aids used in the same room. With this device turned on in a room, no sound can get through any bugging device. With this portable scrambler you can have absolute privacy during your telephone conversations.
Telephone taps are absolutely useless.
Build it into an attach case and never be without it. To use the scrambler, just place the telephone handset into it's cradle and then use the scrambler's handset. Can be used for automatic switching of recorders, transmitters, amplifiers, etc. This instrument is unique in that it utilizes a stereo tape to record all the test results on one track of the tape while all the questions and answers are recorded on the second track. It can be attached to a chart recorder for permanent, graphic recording or may be replayed with full metered display, etc.