The Shure SM58 UHF is a wireless dynamic microphone that is designed for use on the stage for live shows and gigging. I recently used this microphone on my acoustic guitar for a live show that I played. I don't own the mic but the sound guy had a wireless system and a few of these mics that we used the amplify my acoustic guitar signal. It's a Guild acoustic guitar without a pick up, so miking the guitar was a must. I don't know that it had to be wireless, but that's what was on hand. Of course the wireless feature is really most useful for vocals, but it's still nice that you can easily move it where you want without it being attached to any sort of cable. I don't think I'd recommend a wireless microphone in general unless you were going to use it mostly for vocals however. The sound of the mic itself is great, as it's a SM58 and is great for vocals and all instruments in a live setting. The SM58 is the most popular live vocal microphone in the world for a reason, as it's got a full sound, is incredibly sturdy and is very reasonably priced. The wireless version is no different as it's still the same mic just in a different casing. Of course you'll need the UHF system to go along with this microphone, as it needs the base to run off of. For this reason it's definitely important that you need it since it's going to cost a good amount more for the wireless system. Having said this, if you are doing live sound or are a venue in search of a wireless system or microphone, it really won't get much better than a Shure SM58 UHF wireless mic.