Snap-on Speakers MPS-75 Let out the music saved on a Walkman phone by snapping on the MPS-75. With a distinctive design and colors, these small speakers are tuned to sound great and look great with Sony Ericsson handsets. They are tough enough to be able to slip into your pocket or bag without a protective case and taken anywhere. A built-in FM antenna means you get a great reception if you want to tune in the local FM radio stations. Small speakers but a big sound.