The present invention relates to a speaker, comprises a housing having a top housing cap and a bottom housing cabinet. The top housing cap with a plurality of through slots are provided on the top housing cap and the bottom housing cabinet which provides with an accommodating space; a speaker unit having a bowl-shaped seat; an amplifying circuit; an USB cable for gaining the required power; an audio cable for obtaining audio signals; a cup-shaped cabinet that can be provided on the bottom housing cabinet, so a space where a resonating effect can be generated is defined between the bowl-shaped seat of the speaker unit and the cup-shaped cabinet, therefore vibrations generated by the speaker unit is transferred to an output of good-quality sound effect.