US Patent 7162280 Handset for a communication unit

A handset (1) for a communication unit is free from any howling problem even when an output of a speaker is considerably increased in use, wherein a conventional handset often suffers from the howling problem when the output of the speaker is considerably increased. In the handset (1) provided with a casing (11): a bone conduction speaker is housed in an upper portion of the casing (2); a microphone is housed in a lower portion of the casing (2); and, a sound aperture (5) of a microphone portion (4) of the casing (11), in which portion (4) the microphone is housed, is formed in a bottom surface of the casing (2) and/or a lower end side surface of the casing (2).