Abstract
The oesophagus speakers can not speak louder. This seems to be the biggest trouble in daily life for them. Therefore, the handy amplifier produced by way of trial experiment to alleviat their trouble.
This instrument is made up of a microphone, amplifier and speaker. An amplifier and speaker is put in a compact box of 10.0×6.7×2.8cm. A microphone is put in a cap of the fountain pen or pipe and connected with the amplifier by a thin cord of 30cm at the length.
A voice spoken by touching the cap or pipe with the lips is uttered from the speaker through the amplifier in the chest pocket of the coat.
This instrument is recommended by many oesophagus speakers.
