The hearing aid is a small loudspeaker that expands the sound that could not be heard, and then uses the residual hearing of the hearing impaired to send the sound to the auditory center of the brain and feel the sound.The hearing-aid shell prevent the electron component inside from potential damage,so the material need to be firm and shatter-proof as well as harmless to people's skin.
Hearing-aid shell spare parts features:
1.Light weight and bear external force
2.High impact resistance and enviromentally friendly material 
3.Compact design and bear specific tolerance for your requirements
4.Quality assurance admitted by famous company in medical industry