The phone plug is protected by a black plastic cover. It has a secure fit, so we didn't worry about the plug becoming damaged if we were carrying the speakers in a bag. What's more, the plug slid easily into our Sony Ericsson W580i Walkman phone and it didn't pop out accidentally. Just keep in mind that the MPS-75 speakers are compatible only with phones that use its specific plug (adapters for other handsets are not available).
Your cell phone is the power source, but the speakers shouldn't have a noticeable effect on your handset's battery. When paired with our W580i, they delivered admirable sound quality. The volume level also was satisfying. Like the MPS-70 speakers, they're also short on any audio-editing features that would enhance your tunes. At the very least, a speaker-mounted volume button would be welcome, but even that's absent. But here again, we're not going to raise a fuss. The MPS-75 speakers are really all about simplicity.
