AMPLIFIER WITH SPEAKER AND AUDIO DEVICE

PROBLEM TO BE SOLVED: To provide an amplifier with a multifunctional speaker which can prevent collision with a vehicle for reasons that ears of the user are closed up with earphones and which also can be used as a hearing aid or a loudspeaker.SOLUTION: An amplifier with speaker 1 comprises: a first external connection terminal 11 capable of connecting a first cable 2 for inputting an audio signal from an audio device 5; a second external connection terminal 12 capable of connecting a second cable 3 for inputting a sound signal from a microphone 6 and for supplying the power needed for the operation of a built-in amplification circuit of the microphone 6 from a built-in battery of the amplifier with speaker 1; a signal input circuit for imparting a mixture of the audio signal taken in by the first external connection terminal 11 and the sound signal taken in by the second external connection terminal 12 to an amplifier; and a third external connection terminal 13 capable of connecting a third cable 4 for outputting the output amplified by the amplifier to an earphone or a headphone 7.