Abstract: The present invention discloses a handheld device using a sound receiver, such as a mobile phone to receive a sound in the surrounding within an appropriate range, and after the sound volume is amplified appropriately, a source playback device such as an earphone is used to play the amplified sound, so that a person having a hearing problem can just carry a handheld device to have the basic functions of the handheld device such as sending and receiving a short message and also use the sound amplification function thereof to supplement the deficiency of the hearing ability when talking to or communicating with others.