Trial production of the handy amplifier for oesophagus speech

Oesophagus speakers cannot raise their voices. This seems to be the biggest trouble in daily life for them. Therefore, a handy amplifier has been produced by way of trial experiment to alleviate their trouble. This instrument is made up of a microphone, amplifier and speaker. The amplifier and speaker is put in a compact box 10.0 x 6.7 x 2.8 cm. The microphone is put in a cigarette holder and connected to the amplifier by a thin cord 30 cm long. When the sound is uttered whilst touching the holder with the lips it is heard through the speaker via the amplifier in the chest pocket of the coat. This instrument is recommended by many oesophagus speakers.