To provide a mobile terminal device, etc., bearing an entirely-new communication tool which bi-directionally obtains a temporary contact.
The mobile terminal device 102 includes: a primary battery 120; a case body 110 for nondestructively and unexchangeably enclosing the primary battery 120; a communication part 136 for performing sound communication; an operation part 140 for indicating at least one of the start and termination of the sound communication; a control part 132 for controlling the communication part 136, based on the operation of the operation part 140; a sound input part 150 for inputting sound to be transmitted by the communication part 136 when the sound communication is performed; and a sound output part 152 for outputting the sound obtained by the communication part 136 in the sound communication.
URUSHIBATA MUTSU
SHIMOJO MAKOTO
ITO HIROKI
JPH07220190A | 1995-08-18 | |||
JP2001309060A | 2001-11-02 | |||
JPH11511913A | 1999-10-12 | |||
JP2007514369A | 2007-05-31 |