Then you can try using the Voice Silenceron Telephone for important business calls. It is an old invention which is a mouthpiece that prevents sound from escaping while you are talking on your phone. It can be attached to the phone and fits snugly around the speaker’s lips. There is no distortion of the voice.
Design of the past: The Voice Silenceron Telephone for secret talks
they say...
Here’s the pitch: “Your telephone conversation can be made inaudible to others in the same room if the phone is equipped with a new mouthpiece that prevents sound from escaping. It is easily attached to any hand instrument and fits snugly around the speaker’s lips. There is no distortion of the voice. Part of the midget “telephone booth” telescopes to fit the standard cradle phone.”
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