Buy Philips Amplified Speaker 160 Watt Party Speaker TAX5206/94.

With powerful sound and big, pumping bass, this karaoke speaker can fill the room with beats. The built-in battery lets you rock the party outdoors for up to 14 hours play time on a single charge. A mic input (6.3 mm) lets you take the party up a notch. There is also a guitar input, so you can take the lead vocals while you are shredding a solo. Both guitar and mic have their own volume controls on the speaker. You can change your voice, fade vocals, and add echo effects too.