Intercom having a hand-driven power generator unit

An intercom comprising:

• a housing covered with a cover shell;
• a transmitter receiver control circuit board mounted inside said housing, said transmitter receiver control circuit board comprising a CPU (Central Processing Unit), a radio signal receiver circuit, a radio signal transmitter circuit, an oscillator, a main frequency filter circuit, a main frequency signal amplifier, a sub-frequency input circuit, a sub-frequency output circuit, a frequency lock control circuit, a volume control circuit, a speaker voice output circuit, a microphone voice pickup circuit, a voice control circuit, a power control circuit, a power supply circuit, a keypad, and an antenna;
• and
• a hand-driven power generator unit mounted inside said housing and adapted to generate electricity for said transmitter receiver control circuit board, said hand-driven power generator comprising a speed-change gear set, a crank handle pivoted to said housing for operation by a person to rotate said speed-change gear set, and a dynamo coupled to said speed-change gear set and rotatable by said speed-change gear set to generate electricity and to output generated electricity to said transmitter receiver control circuit board.