Hearing Amplifier is called personal sound amplifier product ( PASP ) to help the people for hearing sound amplification as the ear hearing amplifier.With the improved audio technology,the digital hearing amplifier is named hearing aids or hearing aids amplifier for some market.Due to the affordable and cheap cost and price,there are more and more amplifier for hearing impaired,especially,the rechargeable hearing amplifier for seniors and elderly hearing loss.Meanwhile,the portable hearing amplifier and mini pocket hearing amplifier can suitable for old people severe hearing loss with the hearing aids domes.