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It contains buzzer not speaker, friend..Sometimes just connecting a bigger better speaker is all that's required to get more volume. Better acoustics of the speaker enclosure can also increase the volume.
By 'buzzer', are you referring to a piezo transducer?
How do I make a simple amplifier..You could connect two wires from the piezo terminals to the line-in input of an amplifier.
2---4 or 8 ohm?
Please any circuit diagram..Simplest solution would be a simple H-bridge to drive the buzzer in a bridged configuration - this gives you double the voltage, and four times the power.
Please any circuit diagram..
supply voltage is : 5v dcA HEX inverting CMOS buffer chip would do the job - but first you need to find out exactly what the signal levels and supply voltages are - a schematic would be good as well.