MSM1 is intelligent 38 Sound module with Built-in 0.5W audio amplifier, MSM1 can be used stand alone, and also it can be easily used with arduino board just with one wire. To connect it you just need one wire to any arduino digital pin, optional capacitor value 47uF to 1000uF on VCC and GND to MSM1, a speaker 0.25W, suitable is 0.5W 8 ohm, it can also work with 1W speaker. MSM1 have built-in 0.5W Audio amplifier. to further amplify the sound of MSM1 one can use transistors or audio amplifier module, but with 0.5W 8 ohm speaker the sound is pretty loud and clear.
there are countless application for MSM1, it is widely used in toys, vehicles, home appliances, medical equipments, door bells, FYP, mini projects, security modules etc...